Refactor indexer (#25174)

Refactor `modules/indexer` to make it more maintainable. And it can be easier to support more features. I'm trying to solve some of issue searching, this is a precursor to making functional changes. Current supported engines and the index versions: | engines | issues | code | | - | - | - | | db | Just a wrapper for database queries, doesn't need version | - | | bleve | The version of index is **2** | The version of index is **6** | | elasticsearch | The old index has no version, will be treated as version **0** in this PR | The version of index is **1** | | meilisearch | The old index has no version, will be treated as version **0** in this PR | - | ## Changes ### Split Splited it into mutiple packages ```text indexer ├── internal │ ├── bleve │ ├── db │ ├── elasticsearch │ └── meilisearch ├── code │ ├── bleve │ ├── elasticsearch │ └── internal └── issues ├── bleve ├── db ├── elasticsearch ├── internal └── meilisearch ``` - `indexer/interanal`: Internal shared package for indexer. - `indexer/interanal/[engine]`: Internal shared package for each engine (bleve/db/elasticsearch/meilisearch). - `indexer/code`: Implementations for code indexer. - `indexer/code/internal`: Internal shared package for code indexer. - `indexer/code/[engine]`: Implementation via each engine for code indexer. - `indexer/issues`: Implementations for issues indexer. ### Deduplication - Combine `Init/Ping/Close` for code indexer and issues indexer. - ~Combine `issues.indexerHolder` and `code.wrappedIndexer` to `internal.IndexHolder`.~ Remove it, use dummy indexer instead when the indexer is not ready. - Duplicate two copies of creating ES clients. - Duplicate two copies of `indexerID()`. ### Enhancement - [x] Support index version for elasticsearch issues indexer, the old index without version will be treated as version 0. - [x] Fix spell of `elastic_search/ElasticSearch`, it should be `Elasticsearch`. - [x] Improve versioning of ES index. We don't need `Aliases`: - Gitea does't need aliases for "Zero Downtime" because it never delete old indexes. - The old code of issues indexer uses the orignal name to create issue index, so it's tricky to convert it to an alias. - [x] Support index version for meilisearch issues indexer, the old index without version will be treated as version 0. - [x] Do "ping" only when `Ping` has been called, don't ping periodically and cache the status. - [x] Support the context parameter whenever possible. - [x] Fix outdated example config. - [x] Give up the requeue logic of issues indexer: When indexing fails, call Ping to check if it was caused by the engine being unavailable, and only requeue the task if the engine is unavailable. - It is fragile and tricky, could cause data losing (It did happen when I was doing some tests for this PR). And it works for ES only. - Just always requeue the failed task, if it caused by bad data, it's a bug of Gitea which should be fixed. --------- Co-authored-by: Giteabot <teabot@gitea.io>
2025-07-24 11:18:36 +00:00 · 2023-06-23 20:37:56 +08:00
parent b0215c40cd
commit 375fd15fbf
43 changed files with 1374 additions and 1426 deletions
--- a/modules/indexer/code/bleve/bleve.go
+++ b/modules/indexer/code/bleve/bleve.go
@@ -1,14 +1,13 @@
 // Copyright 2019 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT

-package code
+package bleve

 import (
 	"bufio"
 	"context"
 	"fmt"
 	"io"
-	"os"
 	"strconv"
 	"strings"
 	"time"
@@ -17,12 +16,13 @@ import (
 	"code.gitea.io/gitea/modules/analyze"
 	"code.gitea.io/gitea/modules/charset"
 	"code.gitea.io/gitea/modules/git"
-	gitea_bleve "code.gitea.io/gitea/modules/indexer/bleve"
+	"code.gitea.io/gitea/modules/indexer/code/internal"
+	indexer_internal "code.gitea.io/gitea/modules/indexer/internal"
+	inner_bleve "code.gitea.io/gitea/modules/indexer/internal/bleve"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/typesniffer"
-	"code.gitea.io/gitea/modules/util"

 	"github.com/blevesearch/bleve/v2"
 	analyzer_custom "github.com/blevesearch/bleve/v2/analysis/analyzer/custom"
@@ -31,10 +31,8 @@ import (
 	"github.com/blevesearch/bleve/v2/analysis/token/lowercase"
 	"github.com/blevesearch/bleve/v2/analysis/token/unicodenorm"
 	"github.com/blevesearch/bleve/v2/analysis/tokenizer/unicode"
-	"github.com/blevesearch/bleve/v2/index/upsidedown"
 	"github.com/blevesearch/bleve/v2/mapping"
 	"github.com/blevesearch/bleve/v2/search/query"
-	"github.com/ethantkoenig/rupture"
 	"github.com/go-enry/go-enry/v2"
 )

@@ -59,38 +57,6 @@ func addUnicodeNormalizeTokenFilter(m *mapping.IndexMappingImpl) error {
 	})
 }

-// openBleveIndexer open the index at the specified path, checking for metadata
-// updates and bleve version updates.  If index needs to be created (or
-// re-created), returns (nil, nil)
-func openBleveIndexer(path string, latestVersion int) (bleve.Index, error) {
-	_, err := os.Stat(path)
-	if err != nil && os.IsNotExist(err) {
-		return nil, nil
-	} else if err != nil {
-		return nil, err
-	}
-
-	metadata, err := rupture.ReadIndexMetadata(path)
-	if err != nil {
-		return nil, err
-	}
-	if metadata.Version < latestVersion {
-		// the indexer is using a previous version, so we should delete it and
-		// re-populate
-		return nil, util.RemoveAll(path)
-	}
-
-	index, err := bleve.Open(path)
-	if err != nil && err == upsidedown.IncompatibleVersion {
-		// the indexer was built with a previous version of bleve, so we should
-		// delete it and re-populate
-		return nil, util.RemoveAll(path)
-	} else if err != nil {
-		return nil, err
-	}
-	return index, nil
-}
-
 // RepoIndexerData data stored in the repo indexer
 type RepoIndexerData struct {
 	RepoID    int64
@@ -111,8 +77,8 @@ const (
 	repoIndexerLatestVersion = 6
 )

-// createBleveIndexer create a bleve repo indexer if one does not already exist
-func createBleveIndexer(path string, latestVersion int) (bleve.Index, error) {
+// generateBleveIndexMapping generates a bleve index mapping for the repo indexer
+func generateBleveIndexMapping() (mapping.IndexMapping, error) {
 	docMapping := bleve.NewDocumentMapping()
 	numericFieldMapping := bleve.NewNumericFieldMapping()
 	numericFieldMapping.IncludeInAll = false
@@ -147,42 +113,28 @@ func createBleveIndexer(path string, latestVersion int) (bleve.Index, error) {
 	mapping.AddDocumentMapping(repoIndexerDocType, docMapping)
 	mapping.AddDocumentMapping("_all", bleve.NewDocumentDisabledMapping())

-	indexer, err := bleve.New(path, mapping)
-	if err != nil {
-		return nil, err
-	}
-
-	if err = rupture.WriteIndexMetadata(path, &rupture.IndexMetadata{
-		Version: latestVersion,
-	}); err != nil {
-		return nil, err
-	}
-	return indexer, nil
+	return mapping, nil
 }

-var _ Indexer = &BleveIndexer{}
+var _ internal.Indexer = &Indexer{}

-// BleveIndexer represents a bleve indexer implementation
-type BleveIndexer struct {
-	indexDir string
-	indexer  bleve.Index
+// Indexer represents a bleve indexer implementation
+type Indexer struct {
+	inner                    *inner_bleve.Indexer
+	indexer_internal.Indexer // do not composite inner_bleve.Indexer directly to avoid exposing too much
 }

-// NewBleveIndexer creates a new bleve local indexer
-func NewBleveIndexer(indexDir string) (*BleveIndexer, bool, error) {
-	indexer := &BleveIndexer{
-		indexDir: indexDir,
+// NewIndexer creates a new bleve local indexer
+func NewIndexer(indexDir string) *Indexer {
+	inner := inner_bleve.NewIndexer(indexDir, repoIndexerLatestVersion, generateBleveIndexMapping)
+	return &Indexer{
+		Indexer: inner,
+		inner:   inner,
 	}
-	created, err := indexer.init()
-	if err != nil {
-		indexer.Close()
-		return nil, false, err
-	}
-	return indexer, created, err
 }

-func (b *BleveIndexer) addUpdate(ctx context.Context, batchWriter git.WriteCloserError, batchReader *bufio.Reader, commitSha string,
-	update fileUpdate, repo *repo_model.Repository, batch *gitea_bleve.FlushingBatch,
+func (b *Indexer) addUpdate(ctx context.Context, batchWriter git.WriteCloserError, batchReader *bufio.Reader, commitSha string,
+	update internal.FileUpdate, repo *repo_model.Repository, batch *inner_bleve.FlushingBatch,
 ) error {
 	// Ignore vendored files in code search
 	if setting.Indexer.ExcludeVendored && analyze.IsVendor(update.Filename) {
@@ -227,7 +179,7 @@ func (b *BleveIndexer) addUpdate(ctx context.Context, batchWriter git.WriteClose
 	if _, err = batchReader.Discard(1); err != nil {
 		return err
 	}
-	id := filenameIndexerID(repo.ID, update.Filename)
+	id := internal.FilenameIndexerID(repo.ID, update.Filename)
 	return batch.Index(id, &RepoIndexerData{
 		RepoID:    repo.ID,
 		CommitID:  commitSha,
@@ -237,50 +189,14 @@ func (b *BleveIndexer) addUpdate(ctx context.Context, batchWriter git.WriteClose
 	})
 }

-func (b *BleveIndexer) addDelete(filename string, repo *repo_model.Repository, batch *gitea_bleve.FlushingBatch) error {
-	id := filenameIndexerID(repo.ID, filename)
+func (b *Indexer) addDelete(filename string, repo *repo_model.Repository, batch *inner_bleve.FlushingBatch) error {
+	id := internal.FilenameIndexerID(repo.ID, filename)
 	return batch.Delete(id)
 }

-// init init the indexer
-func (b *BleveIndexer) init() (bool, error) {
-	var err error
-	b.indexer, err = openBleveIndexer(b.indexDir, repoIndexerLatestVersion)
-	if err != nil {
-		return false, err
-	}
-	if b.indexer != nil {
-		return false, nil
-	}
-
-	b.indexer, err = createBleveIndexer(b.indexDir, repoIndexerLatestVersion)
-	if err != nil {
-		return false, err
-	}
-
-	return true, nil
-}
-
-// Close close the indexer
-func (b *BleveIndexer) Close() {
-	log.Debug("Closing repo indexer")
-	if b.indexer != nil {
-		err := b.indexer.Close()
-		if err != nil {
-			log.Error("Error whilst closing the repository indexer: %v", err)
-		}
-	}
-	log.Info("PID: %d Repository Indexer closed", os.Getpid())
-}
-
-// Ping does nothing
-func (b *BleveIndexer) Ping() bool {
-	return true
-}
-
 // Index indexes the data
-func (b *BleveIndexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *repoChanges) error {
-	batch := gitea_bleve.NewFlushingBatch(b.indexer, maxBatchSize)
+func (b *Indexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *internal.RepoChanges) error {
+	batch := inner_bleve.NewFlushingBatch(b.inner.Indexer, maxBatchSize)
 	if len(changes.Updates) > 0 {

 		// Now because of some insanity with git cat-file not immediately failing if not run in a valid git directory we need to run git rev-parse first!
@@ -308,14 +224,14 @@ func (b *BleveIndexer) Index(ctx context.Context, repo *repo_model.Repository, s
 }

 // Delete deletes indexes by ids
-func (b *BleveIndexer) Delete(repoID int64) error {
+func (b *Indexer) Delete(_ context.Context, repoID int64) error {
 	query := numericEqualityQuery(repoID, "RepoID")
 	searchRequest := bleve.NewSearchRequestOptions(query, 2147483647, 0, false)
-	result, err := b.indexer.Search(searchRequest)
+	result, err := b.inner.Indexer.Search(searchRequest)
 	if err != nil {
 		return err
 	}
-	batch := gitea_bleve.NewFlushingBatch(b.indexer, maxBatchSize)
+	batch := inner_bleve.NewFlushingBatch(b.inner.Indexer, maxBatchSize)
 	for _, hit := range result.Hits {
 		if err = batch.Delete(hit.ID); err != nil {
 			return err
@@ -326,7 +242,7 @@ func (b *BleveIndexer) Delete(repoID int64) error {

 // Search searches for files in the specified repo.
 // Returns the matching file-paths
-func (b *BleveIndexer) Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*SearchResult, []*SearchResultLanguages, error) {
+func (b *Indexer) Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*internal.SearchResult, []*internal.SearchResultLanguages, error) {
 	var (
 		indexerQuery query.Query
 		keywordQuery query.Query
@@ -379,14 +295,14 @@ func (b *BleveIndexer) Search(ctx context.Context, repoIDs []int64, language, ke
 		searchRequest.AddFacet("languages", bleve.NewFacetRequest("Language", 10))
 	}

-	result, err := b.indexer.SearchInContext(ctx, searchRequest)
+	result, err := b.inner.Indexer.SearchInContext(ctx, searchRequest)
 	if err != nil {
 		return 0, nil, nil, err
 	}

 	total := int64(result.Total)

-	searchResults := make([]*SearchResult, len(result.Hits))
+	searchResults := make([]*internal.SearchResult, len(result.Hits))
 	for i, hit := range result.Hits {
 		startIndex, endIndex := -1, -1
 		for _, locations := range hit.Locations["Content"] {
@@ -405,11 +321,11 @@ func (b *BleveIndexer) Search(ctx context.Context, repoIDs []int64, language, ke
 		if t, err := time.Parse(time.RFC3339, hit.Fields["UpdatedAt"].(string)); err == nil {
 			updatedUnix = timeutil.TimeStamp(t.Unix())
 		}
-		searchResults[i] = &SearchResult{
+		searchResults[i] = &internal.SearchResult{
 			RepoID:      int64(hit.Fields["RepoID"].(float64)),
 			StartIndex:  startIndex,
 			EndIndex:    endIndex,
-			Filename:    filenameOfIndexerID(hit.ID),
+			Filename:    internal.FilenameOfIndexerID(hit.ID),
 			Content:     hit.Fields["Content"].(string),
 			CommitID:    hit.Fields["CommitID"].(string),
 			UpdatedUnix: updatedUnix,
@@ -418,7 +334,7 @@ func (b *BleveIndexer) Search(ctx context.Context, repoIDs []int64, language, ke
 		}
 	}

-	searchResultLanguages := make([]*SearchResultLanguages, 0, 10)
+	searchResultLanguages := make([]*internal.SearchResultLanguages, 0, 10)
 	if len(language) > 0 {
 		// Use separate query to go get all language counts
 		facetRequest := bleve.NewSearchRequestOptions(facetQuery, 1, 0, false)
@@ -426,7 +342,7 @@ func (b *BleveIndexer) Search(ctx context.Context, repoIDs []int64, language, ke
 		facetRequest.IncludeLocations = true
 		facetRequest.AddFacet("languages", bleve.NewFacetRequest("Language", 10))

-		if result, err = b.indexer.Search(facetRequest); err != nil {
+		if result, err = b.inner.Indexer.Search(facetRequest); err != nil {
 			return 0, nil, nil, err
 		}

@@ -436,7 +352,7 @@ func (b *BleveIndexer) Search(ctx context.Context, repoIDs []int64, language, ke
 		if len(term.Term) == 0 {
 			continue
 		}
-		searchResultLanguages = append(searchResultLanguages, &SearchResultLanguages{
+		searchResultLanguages = append(searchResultLanguages, &internal.SearchResultLanguages{
 			Language: term.Term,
 			Color:    enry.GetColor(term.Term),
 			Count:    term.Count,
--- a/modules/indexer/code/bleve_test.go
+++ b/modules/indexer/code/bleve_test.go
@@ -1,30 +0,0 @@
-// Copyright 2019 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package code
-
-import (
-	"testing"
-
-	"code.gitea.io/gitea/models/unittest"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestBleveIndexAndSearch(t *testing.T) {
-	unittest.PrepareTestEnv(t)
-
-	dir := t.TempDir()
-
-	idx, _, err := NewBleveIndexer(dir)
-	if err != nil {
-		assert.Fail(t, "Unable to create bleve indexer Error: %v", err)
-		if idx != nil {
-			idx.Close()
-		}
-		return
-	}
-	defer idx.Close()
-
-	testIndexer("beleve", t, idx)
-}
--- a/modules/indexer/code/elastic_search_test.go
+++ b/modules/indexer/code/elastic_search_test.go
@@ -1,41 +0,0 @@
-// Copyright 2020 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package code
-
-import (
-	"os"
-	"testing"
-
-	"code.gitea.io/gitea/models/unittest"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestESIndexAndSearch(t *testing.T) {
-	unittest.PrepareTestEnv(t)
-
-	u := os.Getenv("TEST_INDEXER_CODE_ES_URL")
-	if u == "" {
-		t.SkipNow()
-		return
-	}
-
-	indexer, _, err := NewElasticSearchIndexer(u, "gitea_codes")
-	if err != nil {
-		assert.Fail(t, "Unable to create ES indexer Error: %v", err)
-		if indexer != nil {
-			indexer.Close()
-		}
-		return
-	}
-	defer indexer.Close()
-
-	testIndexer("elastic_search", t, indexer)
-}
-
-func TestIndexPos(t *testing.T) {
-	startIdx, endIdx := indexPos("test index start and end", "start", "end")
-	assert.EqualValues(t, 11, startIdx)
-	assert.EqualValues(t, 24, endIdx)
-}
--- a/modules/indexer/code/elasticsearch/elasticsearch.go
+++ b/modules/indexer/code/elasticsearch/elasticsearch.go
@@ -1,25 +1,23 @@
 // Copyright 2020 The Gitea Authors. All rights reserved.
 // SPDX-License-Identifier: MIT

-package code
+package elasticsearch

 import (
 	"bufio"
 	"context"
-	"errors"
 	"fmt"
 	"io"
-	"net"
 	"strconv"
 	"strings"
-	"sync"
-	"time"

 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/modules/analyze"
 	"code.gitea.io/gitea/modules/charset"
 	"code.gitea.io/gitea/modules/git"
-	"code.gitea.io/gitea/modules/graceful"
+	"code.gitea.io/gitea/modules/indexer/code/internal"
+	indexer_internal "code.gitea.io/gitea/modules/indexer/internal"
+	inner_elasticsearch "code.gitea.io/gitea/modules/indexer/internal/elasticsearch"
 	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
@@ -38,63 +36,22 @@ const (
 	esMultiMatchTypePhrasePrefix = "phrase_prefix"
 )

-var _ Indexer = &ElasticSearchIndexer{}
+var _ internal.Indexer = &Indexer{}

-// ElasticSearchIndexer implements Indexer interface
-type ElasticSearchIndexer struct {
-	client           *elastic.Client
-	indexerAliasName string
-	available        bool
-	stopTimer        chan struct{}
-	lock             sync.RWMutex
+// Indexer implements Indexer interface
+type Indexer struct {
+	inner                    *inner_elasticsearch.Indexer
+	indexer_internal.Indexer // do not composite inner_elasticsearch.Indexer directly to avoid exposing too much
 }

-// NewElasticSearchIndexer creates a new elasticsearch indexer
-func NewElasticSearchIndexer(url, indexerName string) (*ElasticSearchIndexer, bool, error) {
-	opts := []elastic.ClientOptionFunc{
-		elastic.SetURL(url),
-		elastic.SetSniff(false),
-		elastic.SetHealthcheckInterval(10 * time.Second),
-		elastic.SetGzip(false),
+// NewIndexer creates a new elasticsearch indexer
+func NewIndexer(url, indexerName string) *Indexer {
+	inner := inner_elasticsearch.NewIndexer(url, indexerName, esRepoIndexerLatestVersion, defaultMapping)
+	indexer := &Indexer{
+		inner:   inner,
+		Indexer: inner,
 	}
-
-	logger := log.GetLogger(log.DEFAULT)
-
-	opts = append(opts, elastic.SetTraceLog(&log.PrintfLogger{Logf: logger.Trace}))
-	opts = append(opts, elastic.SetInfoLog(&log.PrintfLogger{Logf: logger.Info}))
-	opts = append(opts, elastic.SetErrorLog(&log.PrintfLogger{Logf: logger.Error}))
-
-	client, err := elastic.NewClient(opts...)
-	if err != nil {
-		return nil, false, err
-	}
-
-	indexer := &ElasticSearchIndexer{
-		client:           client,
-		indexerAliasName: indexerName,
-		available:        true,
-		stopTimer:        make(chan struct{}),
-	}
-
-	ticker := time.NewTicker(10 * time.Second)
-	go func() {
-		for {
-			select {
-			case <-ticker.C:
-				indexer.checkAvailability()
-			case <-indexer.stopTimer:
-				ticker.Stop()
-				return
-			}
-		}
-	}()
-
-	exists, err := indexer.init()
-	if err != nil {
-		indexer.Close()
-		return nil, false, err
-	}
-	return indexer, !exists, err
+	return indexer
 }

 const (
@@ -127,72 +84,7 @@ const (
 	}`
 )

-func (b *ElasticSearchIndexer) realIndexerName() string {
-	return fmt.Sprintf("%s.v%d", b.indexerAliasName, esRepoIndexerLatestVersion)
-}
-
-// Init will initialize the indexer
-func (b *ElasticSearchIndexer) init() (bool, error) {
-	ctx := graceful.GetManager().HammerContext()
-	exists, err := b.client.IndexExists(b.realIndexerName()).Do(ctx)
-	if err != nil {
-		return false, b.checkError(err)
-	}
-	if !exists {
-		mapping := defaultMapping
-
-		createIndex, err := b.client.CreateIndex(b.realIndexerName()).BodyString(mapping).Do(ctx)
-		if err != nil {
-			return false, b.checkError(err)
-		}
-		if !createIndex.Acknowledged {
-			return false, fmt.Errorf("create index %s with %s failed", b.realIndexerName(), mapping)
-		}
-	}
-
-	// check version
-	r, err := b.client.Aliases().Do(ctx)
-	if err != nil {
-		return false, b.checkError(err)
-	}
-
-	realIndexerNames := r.IndicesByAlias(b.indexerAliasName)
-	if len(realIndexerNames) < 1 {
-		res, err := b.client.Alias().
-			Add(b.realIndexerName(), b.indexerAliasName).
-			Do(ctx)
-		if err != nil {
-			return false, b.checkError(err)
-		}
-		if !res.Acknowledged {
-			return false, fmt.Errorf("create alias %s to index %s failed", b.indexerAliasName, b.realIndexerName())
-		}
-	} else if len(realIndexerNames) >= 1 && realIndexerNames[0] < b.realIndexerName() {
-		log.Warn("Found older gitea indexer named %s, but we will create a new one %s and keep the old NOT DELETED. You can delete the old version after the upgrade succeed.",
-			realIndexerNames[0], b.realIndexerName())
-		res, err := b.client.Alias().
-			Remove(realIndexerNames[0], b.indexerAliasName).
-			Add(b.realIndexerName(), b.indexerAliasName).
-			Do(ctx)
-		if err != nil {
-			return false, b.checkError(err)
-		}
-		if !res.Acknowledged {
-			return false, fmt.Errorf("change alias %s to index %s failed", b.indexerAliasName, b.realIndexerName())
-		}
-	}
-
-	return exists, nil
-}
-
-// Ping checks if elastic is available
-func (b *ElasticSearchIndexer) Ping() bool {
-	b.lock.RLock()
-	defer b.lock.RUnlock()
-	return b.available
-}
-
-func (b *ElasticSearchIndexer) addUpdate(ctx context.Context, batchWriter git.WriteCloserError, batchReader *bufio.Reader, sha string, update fileUpdate, repo *repo_model.Repository) ([]elastic.BulkableRequest, error) {
+func (b *Indexer) addUpdate(ctx context.Context, batchWriter git.WriteCloserError, batchReader *bufio.Reader, sha string, update internal.FileUpdate, repo *repo_model.Repository) ([]elastic.BulkableRequest, error) {
 	// Ignore vendored files in code search
 	if setting.Indexer.ExcludeVendored && analyze.IsVendor(update.Filename) {
 		return nil, nil
@@ -235,11 +127,11 @@ func (b *ElasticSearchIndexer) addUpdate(ctx context.Context, batchWriter git.Wr
 	if _, err = batchReader.Discard(1); err != nil {
 		return nil, err
 	}
-	id := filenameIndexerID(repo.ID, update.Filename)
+	id := internal.FilenameIndexerID(repo.ID, update.Filename)

 	return []elastic.BulkableRequest{
 		elastic.NewBulkIndexRequest().
-			Index(b.indexerAliasName).
+			Index(b.inner.VersionedIndexName()).
 			Id(id).
 			Doc(map[string]interface{}{
 				"repo_id":    repo.ID,
@@ -251,15 +143,15 @@ func (b *ElasticSearchIndexer) addUpdate(ctx context.Context, batchWriter git.Wr
 	}, nil
 }

-func (b *ElasticSearchIndexer) addDelete(filename string, repo *repo_model.Repository) elastic.BulkableRequest {
-	id := filenameIndexerID(repo.ID, filename)
+func (b *Indexer) addDelete(filename string, repo *repo_model.Repository) elastic.BulkableRequest {
+	id := internal.FilenameIndexerID(repo.ID, filename)
 	return elastic.NewBulkDeleteRequest().
-		Index(b.indexerAliasName).
+		Index(b.inner.VersionedIndexName()).
 		Id(id)
 }

 // Index will save the index data
-func (b *ElasticSearchIndexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *repoChanges) error {
+func (b *Indexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *internal.RepoChanges) error {
 	reqs := make([]elastic.BulkableRequest, 0)
 	if len(changes.Updates) > 0 {
 		// Now because of some insanity with git cat-file not immediately failing if not run in a valid git directory we need to run git rev-parse first!
@@ -288,21 +180,21 @@ func (b *ElasticSearchIndexer) Index(ctx context.Context, repo *repo_model.Repos
 	}

 	if len(reqs) > 0 {
-		_, err := b.client.Bulk().
-			Index(b.indexerAliasName).
+		_, err := b.inner.Client.Bulk().
+			Index(b.inner.VersionedIndexName()).
 			Add(reqs...).
 			Do(ctx)
-		return b.checkError(err)
+		return err
 	}
 	return nil
 }

 // Delete deletes indexes by ids
-func (b *ElasticSearchIndexer) Delete(repoID int64) error {
-	_, err := b.client.DeleteByQuery(b.indexerAliasName).
+func (b *Indexer) Delete(ctx context.Context, repoID int64) error {
+	_, err := b.inner.Client.DeleteByQuery(b.inner.VersionedIndexName()).
 		Query(elastic.NewTermsQuery("repo_id", repoID)).
-		Do(graceful.GetManager().HammerContext())
-	return b.checkError(err)
+		Do(ctx)
+	return err
 }

 // indexPos find words positions for start and the following end on content. It will
@@ -321,8 +213,8 @@ func indexPos(content, start, end string) (int, int) {
 	return startIdx, startIdx + len(start) + endIdx + len(end)
 }

-func convertResult(searchResult *elastic.SearchResult, kw string, pageSize int) (int64, []*SearchResult, []*SearchResultLanguages, error) {
-	hits := make([]*SearchResult, 0, pageSize)
+func convertResult(searchResult *elastic.SearchResult, kw string, pageSize int) (int64, []*internal.SearchResult, []*internal.SearchResultLanguages, error) {
+	hits := make([]*internal.SearchResult, 0, pageSize)
 	for _, hit := range searchResult.Hits.Hits {
 		// FIXME: There is no way to get the position the keyword on the content currently on the same request.
 		// So we get it from content, this may made the query slower. See
@@ -341,7 +233,7 @@ func convertResult(searchResult *elastic.SearchResult, kw string, pageSize int)
 			panic(fmt.Sprintf("2===%#v", hit.Highlight))
 		}

-		repoID, fileName := parseIndexerID(hit.Id)
+		repoID, fileName := internal.ParseIndexerID(hit.Id)
 		res := make(map[string]interface{})
 		if err := json.Unmarshal(hit.Source, &res); err != nil {
 			return 0, nil, nil, err
@@ -349,7 +241,7 @@ func convertResult(searchResult *elastic.SearchResult, kw string, pageSize int)

 		language := res["language"].(string)

-		hits = append(hits, &SearchResult{
+		hits = append(hits, &internal.SearchResult{
 			RepoID:      repoID,
 			Filename:    fileName,
 			CommitID:    res["commit_id"].(string),
@@ -365,14 +257,14 @@ func convertResult(searchResult *elastic.SearchResult, kw string, pageSize int)
 	return searchResult.TotalHits(), hits, extractAggs(searchResult), nil
 }

-func extractAggs(searchResult *elastic.SearchResult) []*SearchResultLanguages {
-	var searchResultLanguages []*SearchResultLanguages
+func extractAggs(searchResult *elastic.SearchResult) []*internal.SearchResultLanguages {
+	var searchResultLanguages []*internal.SearchResultLanguages
 	agg, found := searchResult.Aggregations.Terms("language")
 	if found {
-		searchResultLanguages = make([]*SearchResultLanguages, 0, 10)
+		searchResultLanguages = make([]*internal.SearchResultLanguages, 0, 10)

 		for _, bucket := range agg.Buckets {
-			searchResultLanguages = append(searchResultLanguages, &SearchResultLanguages{
+			searchResultLanguages = append(searchResultLanguages, &internal.SearchResultLanguages{
 				Language: bucket.Key.(string),
 				Color:    enry.GetColor(bucket.Key.(string)),
 				Count:    int(bucket.DocCount),
@@ -383,7 +275,7 @@ func extractAggs(searchResult *elastic.SearchResult) []*SearchResultLanguages {
 }

 // Search searches for codes and language stats by given conditions.
-func (b *ElasticSearchIndexer) Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*SearchResult, []*SearchResultLanguages, error) {
+func (b *Indexer) Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*internal.SearchResult, []*internal.SearchResultLanguages, error) {
 	searchType := esMultiMatchTypeBestFields
 	if isMatch {
 		searchType = esMultiMatchTypePhrasePrefix
@@ -412,8 +304,8 @@ func (b *ElasticSearchIndexer) Search(ctx context.Context, repoIDs []int64, lang
 	}

 	if len(language) == 0 {
-		searchResult, err := b.client.Search().
-			Index(b.indexerAliasName).
+		searchResult, err := b.inner.Client.Search().
+			Index(b.inner.VersionedIndexName()).
 			Aggregation("language", aggregation).
 			Query(query).
 			Highlight(
@@ -426,26 +318,26 @@ func (b *ElasticSearchIndexer) Search(ctx context.Context, repoIDs []int64, lang
 			From(start).Size(pageSize).
 			Do(ctx)
 		if err != nil {
-			return 0, nil, nil, b.checkError(err)
+			return 0, nil, nil, err
 		}

 		return convertResult(searchResult, kw, pageSize)
 	}

 	langQuery := elastic.NewMatchQuery("language", language)
-	countResult, err := b.client.Search().
-		Index(b.indexerAliasName).
+	countResult, err := b.inner.Client.Search().
+		Index(b.inner.VersionedIndexName()).
 		Aggregation("language", aggregation).
 		Query(query).
-		Size(0). // We only needs stats information
+		Size(0). // We only need stats information
 		Do(ctx)
 	if err != nil {
-		return 0, nil, nil, b.checkError(err)
+		return 0, nil, nil, err
 	}

 	query = query.Must(langQuery)
-	searchResult, err := b.client.Search().
-		Index(b.indexerAliasName).
+	searchResult, err := b.inner.Client.Search().
+		Index(b.inner.VersionedIndexName()).
 		Query(query).
 		Highlight(
 			elastic.NewHighlight().
@@ -457,56 +349,10 @@ func (b *ElasticSearchIndexer) Search(ctx context.Context, repoIDs []int64, lang
 		From(start).Size(pageSize).
 		Do(ctx)
 	if err != nil {
-		return 0, nil, nil, b.checkError(err)
+		return 0, nil, nil, err
 	}

 	total, hits, _, err := convertResult(searchResult, kw, pageSize)

 	return total, hits, extractAggs(countResult), err
 }
-
-// Close implements indexer
-func (b *ElasticSearchIndexer) Close() {
-	select {
-	case <-b.stopTimer:
-	default:
-		close(b.stopTimer)
-	}
-}
-
-func (b *ElasticSearchIndexer) checkError(err error) error {
-	var opErr *net.OpError
-	if !(elastic.IsConnErr(err) || (errors.As(err, &opErr) && (opErr.Op == "dial" || opErr.Op == "read"))) {
-		return err
-	}
-
-	b.setAvailability(false)
-
-	return err
-}
-
-func (b *ElasticSearchIndexer) checkAvailability() {
-	if b.Ping() {
-		return
-	}
-
-	// Request cluster state to check if elastic is available again
-	_, err := b.client.ClusterState().Do(graceful.GetManager().ShutdownContext())
-	if err != nil {
-		b.setAvailability(false)
-		return
-	}
-
-	b.setAvailability(true)
-}
-
-func (b *ElasticSearchIndexer) setAvailability(available bool) {
-	b.lock.Lock()
-	defer b.lock.Unlock()
-
-	if b.available == available {
-		return
-	}
-
-	b.available = available
-}
--- a/modules/indexer/code/elasticsearch/elasticsearch_test.go
+++ b/modules/indexer/code/elasticsearch/elasticsearch_test.go
@@ -0,0 +1,16 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package elasticsearch
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIndexPos(t *testing.T) {
+	startIdx, endIdx := indexPos("test index start and end", "start", "end")
+	assert.EqualValues(t, 11, startIdx)
+	assert.EqualValues(t, 24, endIdx)
+}
--- a/modules/indexer/code/git.go
+++ b/modules/indexer/code/git.go
@@ -10,23 +10,11 @@ import (

 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/indexer/code/internal"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 )

-type fileUpdate struct {
-	Filename string
-	BlobSha  string
-	Size     int64
-	Sized    bool
-}
-
-// repoChanges changes (file additions/updates/removals) to a repo
-type repoChanges struct {
-	Updates          []fileUpdate
-	RemovedFilenames []string
-}
-
 func getDefaultBranchSha(ctx context.Context, repo *repo_model.Repository) (string, error) {
 	stdout, _, err := git.NewCommand(ctx, "show-ref", "-s").AddDynamicArguments(git.BranchPrefix + repo.DefaultBranch).RunStdString(&git.RunOpts{Dir: repo.RepoPath()})
 	if err != nil {
@@ -36,7 +24,7 @@ func getDefaultBranchSha(ctx context.Context, repo *repo_model.Repository) (stri
 }

 // getRepoChanges returns changes to repo since last indexer update
-func getRepoChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*repoChanges, error) {
+func getRepoChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*internal.RepoChanges, error) {
 	status, err := repo_model.GetIndexerStatus(ctx, repo, repo_model.RepoIndexerTypeCode)
 	if err != nil {
 		return nil, err
@@ -67,16 +55,16 @@ func isIndexable(entry *git.TreeEntry) bool {
 }

 // parseGitLsTreeOutput parses the output of a `git ls-tree -r --full-name` command
-func parseGitLsTreeOutput(stdout []byte) ([]fileUpdate, error) {
+func parseGitLsTreeOutput(stdout []byte) ([]internal.FileUpdate, error) {
 	entries, err := git.ParseTreeEntries(stdout)
 	if err != nil {
 		return nil, err
 	}
 	idxCount := 0
-	updates := make([]fileUpdate, len(entries))
+	updates := make([]internal.FileUpdate, len(entries))
 	for _, entry := range entries {
 		if isIndexable(entry) {
-			updates[idxCount] = fileUpdate{
+			updates[idxCount] = internal.FileUpdate{
 				Filename: entry.Name(),
 				BlobSha:  entry.ID.String(),
 				Size:     entry.Size(),
@@ -89,8 +77,8 @@ func parseGitLsTreeOutput(stdout []byte) ([]fileUpdate, error) {
 }

 // genesisChanges get changes to add repo to the indexer for the first time
-func genesisChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*repoChanges, error) {
-	var changes repoChanges
+func genesisChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*internal.RepoChanges, error) {
+	var changes internal.RepoChanges
 	stdout, _, runErr := git.NewCommand(ctx, "ls-tree", "--full-tree", "-l", "-r").AddDynamicArguments(revision).RunStdBytes(&git.RunOpts{Dir: repo.RepoPath()})
 	if runErr != nil {
 		return nil, runErr
@@ -102,20 +90,20 @@ func genesisChanges(ctx context.Context, repo *repo_model.Repository, revision s
 }

 // nonGenesisChanges get changes since the previous indexer update
-func nonGenesisChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*repoChanges, error) {
+func nonGenesisChanges(ctx context.Context, repo *repo_model.Repository, revision string) (*internal.RepoChanges, error) {
 	diffCmd := git.NewCommand(ctx, "diff", "--name-status").AddDynamicArguments(repo.CodeIndexerStatus.CommitSha, revision)
 	stdout, _, runErr := diffCmd.RunStdString(&git.RunOpts{Dir: repo.RepoPath()})
 	if runErr != nil {
 		// previous commit sha may have been removed by a force push, so
 		// try rebuilding from scratch
 		log.Warn("git diff: %v", runErr)
-		if err := indexer.Delete(repo.ID); err != nil {
+		if err := (*globalIndexer.Load()).Delete(ctx, repo.ID); err != nil {
 			return nil, err
 		}
 		return genesisChanges(ctx, repo, revision)
 	}

-	var changes repoChanges
+	var changes internal.RepoChanges
 	var err error
 	updatedFilenames := make([]string, 0, 10)
 	for _, line := range strings.Split(stdout, "\n") {
--- a/modules/indexer/code/indexer.go
+++ b/modules/indexer/code/indexer.go
@@ -7,86 +7,41 @@ import (
 	"context"
 	"os"
 	"runtime/pprof"
-	"strconv"
-	"strings"
+	"sync/atomic"
 	"time"

 	"code.gitea.io/gitea/models/db"
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/modules/graceful"
+	"code.gitea.io/gitea/modules/indexer/code/bleve"
+	"code.gitea.io/gitea/modules/indexer/code/elasticsearch"
+	"code.gitea.io/gitea/modules/indexer/code/internal"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/queue"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
 )

-// SearchResult result of performing a search in a repo
-type SearchResult struct {
-	RepoID      int64
-	StartIndex  int
-	EndIndex    int
-	Filename    string
-	Content     string
-	CommitID    string
-	UpdatedUnix timeutil.TimeStamp
-	Language    string
-	Color       string
+var (
+	indexerQueue *queue.WorkerPoolQueue[*internal.IndexerData]
+	// globalIndexer is the global indexer, it cannot be nil.
+	// When the real indexer is not ready, it will be a dummy indexer which will return error to explain it's not ready.
+	// So it's always safe use it as *globalIndexer.Load() and call its methods.
+	globalIndexer atomic.Pointer[internal.Indexer]
+	dummyIndexer  *internal.Indexer
+)
+
+func init() {
+	i := internal.NewDummyIndexer()
+	dummyIndexer = &i
+	globalIndexer.Store(dummyIndexer)
 }

-// SearchResultLanguages result of top languages count in search results
-type SearchResultLanguages struct {
-	Language string
-	Color    string
-	Count    int
-}
-
-// Indexer defines an interface to index and search code contents
-type Indexer interface {
-	Ping() bool
-	Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *repoChanges) error
-	Delete(repoID int64) error
-	Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*SearchResult, []*SearchResultLanguages, error)
-	Close()
-}
-
-func filenameIndexerID(repoID int64, filename string) string {
-	return indexerID(repoID) + "_" + filename
-}
-
-func indexerID(id int64) string {
-	return strconv.FormatInt(id, 36)
-}
-
-func parseIndexerID(indexerID string) (int64, string) {
-	index := strings.IndexByte(indexerID, '_')
-	if index == -1 {
-		log.Error("Unexpected ID in repo indexer: %s", indexerID)
-	}
-	repoID, _ := strconv.ParseInt(indexerID[:index], 36, 64)
-	return repoID, indexerID[index+1:]
-}
-
-func filenameOfIndexerID(indexerID string) string {
-	index := strings.IndexByte(indexerID, '_')
-	if index == -1 {
-		log.Error("Unexpected ID in repo indexer: %s", indexerID)
-	}
-	return indexerID[index+1:]
-}
-
-// IndexerData represents data stored in the code indexer
-type IndexerData struct {
-	RepoID int64
-}
-
-var indexerQueue *queue.WorkerPoolQueue[*IndexerData]
-
-func index(ctx context.Context, indexer Indexer, repoID int64) error {
+func index(ctx context.Context, indexer internal.Indexer, repoID int64) error {
 	repo, err := repo_model.GetRepositoryByID(ctx, repoID)
 	if repo_model.IsErrRepoNotExist(err) {
-		return indexer.Delete(repoID)
+		return indexer.Delete(ctx, repoID)
 	}
 	if err != nil {
 		return err
@@ -139,7 +94,7 @@ func index(ctx context.Context, indexer Indexer, repoID int64) error {
 // Init initialize the repo indexer
 func Init() {
 	if !setting.Indexer.RepoIndexerEnabled {
-		indexer.Close()
+		(*globalIndexer.Load()).Close()
 		return
 	}

@@ -153,7 +108,7 @@ func Init() {
 		}
 		cancel()
 		log.Debug("Closing repository indexer")
-		indexer.Close()
+		(*globalIndexer.Load()).Close()
 		log.Info("PID: %d Repository Indexer closed", os.Getpid())
 		finished()
 	})
@@ -163,13 +118,8 @@ func Init() {
 	// Create the Queue
 	switch setting.Indexer.RepoType {
 	case "bleve", "elasticsearch":
-		handler := func(items ...*IndexerData) (unhandled []*IndexerData) {
-			idx, err := indexer.get()
-			if idx == nil || err != nil {
-				log.Warn("Codes indexer handler: indexer is not ready, retry later.")
-				return items
-			}
-
+		handler := func(items ...*internal.IndexerData) (unhandled []*internal.IndexerData) {
+			indexer := *globalIndexer.Load()
 			for _, indexerData := range items {
 				log.Trace("IndexerData Process Repo: %d", indexerData.RepoID)

@@ -188,11 +138,7 @@ func Init() {
 					code.gitea.io/gitea/modules/indexer/code.index(indexer.go:105)
 				*/
 				if err := index(ctx, indexer, indexerData.RepoID); err != nil {
-					if !idx.Ping() {
-						log.Error("Code indexer handler: indexer is unavailable.")
-						unhandled = append(unhandled, indexerData)
-						continue
-					}
+					unhandled = append(unhandled, indexerData)
 					if !setting.IsInTesting {
 						log.Error("Codes indexer handler: index error for repo %v: %v", indexerData.RepoID, err)
 					}
@@ -213,8 +159,8 @@ func Init() {
 		pprof.SetGoroutineLabels(ctx)
 		start := time.Now()
 		var (
-			rIndexer Indexer
-			populate bool
+			rIndexer internal.Indexer
+			existed  bool
 			err      error
 		)
 		switch setting.Indexer.RepoType {
@@ -228,10 +174,11 @@ func Init() {
 				}
 			}()

-			rIndexer, populate, err = NewBleveIndexer(setting.Indexer.RepoPath)
+			rIndexer = bleve.NewIndexer(setting.Indexer.RepoPath)
+			existed, err = rIndexer.Init(ctx)
 			if err != nil {
 				cancel()
-				indexer.Close()
+				(*globalIndexer.Load()).Close()
 				close(waitChannel)
 				log.Fatal("PID: %d Unable to initialize the bleve Repository Indexer at path: %s Error: %v", os.Getpid(), setting.Indexer.RepoPath, err)
 			}
@@ -245,23 +192,31 @@ func Init() {
 				}
 			}()

-			rIndexer, populate, err = NewElasticSearchIndexer(setting.Indexer.RepoConnStr, setting.Indexer.RepoIndexerName)
+			rIndexer = elasticsearch.NewIndexer(setting.Indexer.RepoConnStr, setting.Indexer.RepoIndexerName)
 			if err != nil {
 				cancel()
-				indexer.Close()
+				(*globalIndexer.Load()).Close()
+				close(waitChannel)
+				log.Fatal("PID: %d Unable to create the elasticsearch Repository Indexer connstr: %s Error: %v", os.Getpid(), setting.Indexer.RepoConnStr, err)
+			}
+			existed, err = rIndexer.Init(ctx)
+			if err != nil {
+				cancel()
+				(*globalIndexer.Load()).Close()
 				close(waitChannel)
 				log.Fatal("PID: %d Unable to initialize the elasticsearch Repository Indexer connstr: %s Error: %v", os.Getpid(), setting.Indexer.RepoConnStr, err)
 			}
+
 		default:
 			log.Fatal("PID: %d Unknown Indexer type: %s", os.Getpid(), setting.Indexer.RepoType)
 		}

-		indexer.set(rIndexer)
+		globalIndexer.Store(&rIndexer)

 		// Start processing the queue
 		go graceful.GetManager().RunWithCancel(indexerQueue)

-		if populate {
+		if !existed { // populate the index because it's created for the first time
 			go graceful.GetManager().RunWithShutdownContext(populateRepoIndexer)
 		}
 		select {
@@ -283,18 +238,18 @@ func Init() {
 			case <-graceful.GetManager().IsShutdown():
 				log.Warn("Shutdown before Repository Indexer completed initialization")
 				cancel()
-				indexer.Close()
+				(*globalIndexer.Load()).Close()
 			case duration, ok := <-waitChannel:
 				if !ok {
 					log.Warn("Repository Indexer Initialization failed")
 					cancel()
-					indexer.Close()
+					(*globalIndexer.Load()).Close()
 					return
 				}
 				log.Info("Repository Indexer Initialization took %v", duration)
 			case <-time.After(timeout):
 				cancel()
-				indexer.Close()
+				(*globalIndexer.Load()).Close()
 				log.Fatal("Repository Indexer Initialization Timed-Out after: %v", timeout)
 			}
 		}()
@@ -303,21 +258,15 @@ func Init() {

 // UpdateRepoIndexer update a repository's entries in the indexer
 func UpdateRepoIndexer(repo *repo_model.Repository) {
-	indexData := &IndexerData{RepoID: repo.ID}
+	indexData := &internal.IndexerData{RepoID: repo.ID}
 	if err := indexerQueue.Push(indexData); err != nil {
 		log.Error("Update repo index data %v failed: %v", indexData, err)
 	}
 }

 // IsAvailable checks if issue indexer is available
-func IsAvailable() bool {
-	idx, err := indexer.get()
-	if err != nil {
-		log.Error("IsAvailable(): unable to get indexer: %v", err)
-		return false
-	}
-
-	return idx.Ping()
+func IsAvailable(ctx context.Context) bool {
+	return (*globalIndexer.Load()).Ping(ctx) == nil
 }

 // populateRepoIndexer populate the repo indexer with pre-existing data. This
@@ -368,7 +317,7 @@ func populateRepoIndexer(ctx context.Context) {
 				return
 			default:
 			}
-			if err := indexerQueue.Push(&IndexerData{RepoID: id}); err != nil {
+			if err := indexerQueue.Push(&internal.IndexerData{RepoID: id}); err != nil {
 				log.Error("indexerQueue.Push: %v", err)
 				return
 			}
--- a/modules/indexer/code/indexer_test.go
+++ b/modules/indexer/code/indexer_test.go
@@ -5,11 +5,15 @@ package code

 import (
 	"context"
+	"os"
 	"path/filepath"
 	"testing"

 	"code.gitea.io/gitea/models/unittest"
 	"code.gitea.io/gitea/modules/git"
+	"code.gitea.io/gitea/modules/indexer/code/bleve"
+	"code.gitea.io/gitea/modules/indexer/code/elasticsearch"
+	"code.gitea.io/gitea/modules/indexer/code/internal"

 	_ "code.gitea.io/gitea/models"

@@ -22,7 +26,7 @@ func TestMain(m *testing.M) {
 	})
 }

-func testIndexer(name string, t *testing.T, indexer Indexer) {
+func testIndexer(name string, t *testing.T, indexer internal.Indexer) {
 	t.Run(name, func(t *testing.T) {
 		var repoID int64 = 1
 		err := index(git.DefaultContext, indexer, repoID)
@@ -81,6 +85,48 @@ func testIndexer(name string, t *testing.T, indexer Indexer) {
 			})
 		}

-		assert.NoError(t, indexer.Delete(repoID))
+		assert.NoError(t, indexer.Delete(context.Background(), repoID))
 	})
 }
+
+func TestBleveIndexAndSearch(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+
+	dir := t.TempDir()
+
+	idx := bleve.NewIndexer(dir)
+	_, err := idx.Init(context.Background())
+	if err != nil {
+		assert.Fail(t, "Unable to create bleve indexer Error: %v", err)
+		if idx != nil {
+			idx.Close()
+		}
+		return
+	}
+	defer idx.Close()
+
+	testIndexer("beleve", t, idx)
+}
+
+func TestESIndexAndSearch(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+
+	u := os.Getenv("TEST_INDEXER_CODE_ES_URL")
+	if u == "" {
+		t.SkipNow()
+		return
+	}
+
+	indexer := elasticsearch.NewIndexer(u, "gitea_codes")
+	if _, err := indexer.Init(context.Background()); err != nil {
+		assert.Fail(t, "Unable to init ES indexer Error: %v", err)
+		if indexer != nil {
+			indexer.Close()
+		}
+		return
+	}
+
+	defer indexer.Close()
+
+	testIndexer("elastic_search", t, indexer)
+}
--- a/modules/indexer/code/internal/indexer.go
+++ b/modules/indexer/code/internal/indexer.go
@@ -0,0 +1,43 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package internal
+
+import (
+	"context"
+	"fmt"
+
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/modules/indexer/internal"
+)
+
+// Indexer defines an interface to index and search code contents
+type Indexer interface {
+	internal.Indexer
+	Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *RepoChanges) error
+	Delete(ctx context.Context, repoID int64) error
+	Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*SearchResult, []*SearchResultLanguages, error)
+}
+
+// NewDummyIndexer returns a dummy indexer
+func NewDummyIndexer() Indexer {
+	return &dummyIndexer{
+		Indexer: internal.NewDummyIndexer(),
+	}
+}
+
+type dummyIndexer struct {
+	internal.Indexer
+}
+
+func (d *dummyIndexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *RepoChanges) error {
+	return fmt.Errorf("indexer is not ready")
+}
+
+func (d *dummyIndexer) Delete(ctx context.Context, repoID int64) error {
+	return fmt.Errorf("indexer is not ready")
+}
+
+func (d *dummyIndexer) Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*SearchResult, []*SearchResultLanguages, error) {
+	return 0, nil, nil, fmt.Errorf("indexer is not ready")
+}
--- a/modules/indexer/code/internal/model.go
+++ b/modules/indexer/code/internal/model.go
@@ -0,0 +1,44 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package internal
+
+import "code.gitea.io/gitea/modules/timeutil"
+
+type FileUpdate struct {
+	Filename string
+	BlobSha  string
+	Size     int64
+	Sized    bool
+}
+
+// RepoChanges changes (file additions/updates/removals) to a repo
+type RepoChanges struct {
+	Updates          []FileUpdate
+	RemovedFilenames []string
+}
+
+// IndexerData represents data stored in the code indexer
+type IndexerData struct {
+	RepoID int64
+}
+
+// SearchResult result of performing a search in a repo
+type SearchResult struct {
+	RepoID      int64
+	StartIndex  int
+	EndIndex    int
+	Filename    string
+	Content     string
+	CommitID    string
+	UpdatedUnix timeutil.TimeStamp
+	Language    string
+	Color       string
+}
+
+// SearchResultLanguages result of top languages count in search results
+type SearchResultLanguages struct {
+	Language string
+	Color    string
+	Count    int
+}
--- a/modules/indexer/code/internal/util.go
+++ b/modules/indexer/code/internal/util.go
@@ -0,0 +1,32 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package internal
+
+import (
+	"strings"
+
+	"code.gitea.io/gitea/modules/indexer/internal"
+	"code.gitea.io/gitea/modules/log"
+)
+
+func FilenameIndexerID(repoID int64, filename string) string {
+	return internal.Base36(repoID) + "_" + filename
+}
+
+func ParseIndexerID(indexerID string) (int64, string) {
+	index := strings.IndexByte(indexerID, '_')
+	if index == -1 {
+		log.Error("Unexpected ID in repo indexer: %s", indexerID)
+	}
+	repoID, _ := internal.ParseBase36(indexerID[:index])
+	return repoID, indexerID[index+1:]
+}
+
+func FilenameOfIndexerID(indexerID string) string {
+	index := strings.IndexByte(indexerID, '_')
+	if index == -1 {
+		log.Error("Unexpected ID in repo indexer: %s", indexerID)
+	}
+	return indexerID[index+1:]
+}
--- a/modules/indexer/code/search.go
+++ b/modules/indexer/code/search.go
@@ -9,6 +9,7 @@ import (
 	"strings"

 	"code.gitea.io/gitea/modules/highlight"
+	"code.gitea.io/gitea/modules/indexer/code/internal"
 	"code.gitea.io/gitea/modules/timeutil"
 	"code.gitea.io/gitea/modules/util"
 )
@@ -25,6 +26,8 @@ type Result struct {
 	FormattedLines string
 }

+type SearchResultLanguages = internal.SearchResultLanguages
+
 func indices(content string, selectionStartIndex, selectionEndIndex int) (int, int) {
 	startIndex := selectionStartIndex
 	numLinesBefore := 0
@@ -61,7 +64,7 @@ func writeStrings(buf *bytes.Buffer, strs ...string) error {
 	return nil
 }

-func searchResult(result *SearchResult, startIndex, endIndex int) (*Result, error) {
+func searchResult(result *internal.SearchResult, startIndex, endIndex int) (*Result, error) {
 	startLineNum := 1 + strings.Count(result.Content[:startIndex], "\n")

 	var formattedLinesBuffer bytes.Buffer
@@ -109,12 +112,12 @@ func searchResult(result *SearchResult, startIndex, endIndex int) (*Result, erro
 }

 // PerformSearch perform a search on a repository
-func PerformSearch(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int, []*Result, []*SearchResultLanguages, error) {
+func PerformSearch(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int, []*Result, []*internal.SearchResultLanguages, error) {
 	if len(keyword) == 0 {
 		return 0, nil, nil, nil
 	}

-	total, results, resultLanguages, err := indexer.Search(ctx, repoIDs, language, keyword, page, pageSize, isMatch)
+	total, results, resultLanguages, err := (*globalIndexer.Load()).Search(ctx, repoIDs, language, keyword, page, pageSize, isMatch)
 	if err != nil {
 		return 0, nil, nil, err
 	}
--- a/modules/indexer/code/wrapped.go
+++ b/modules/indexer/code/wrapped.go
@@ -1,104 +0,0 @@
-// Copyright 2019 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package code
-
-import (
-	"context"
-	"fmt"
-	"sync"
-
-	repo_model "code.gitea.io/gitea/models/repo"
-	"code.gitea.io/gitea/modules/log"
-)
-
-var indexer = newWrappedIndexer()
-
-// ErrWrappedIndexerClosed is the error returned if the indexer was closed before it was ready
-var ErrWrappedIndexerClosed = fmt.Errorf("Indexer closed before ready")
-
-type wrappedIndexer struct {
-	internal Indexer
-	lock     sync.RWMutex
-	cond     *sync.Cond
-	closed   bool
-}
-
-func newWrappedIndexer() *wrappedIndexer {
-	w := &wrappedIndexer{}
-	w.cond = sync.NewCond(w.lock.RLocker())
-	return w
-}
-
-func (w *wrappedIndexer) set(indexer Indexer) {
-	w.lock.Lock()
-	defer w.lock.Unlock()
-	if w.closed {
-		// Too late!
-		indexer.Close()
-	}
-	w.internal = indexer
-	w.cond.Broadcast()
-}
-
-func (w *wrappedIndexer) get() (Indexer, error) {
-	w.lock.RLock()
-	defer w.lock.RUnlock()
-	if w.internal == nil {
-		if w.closed {
-			return nil, ErrWrappedIndexerClosed
-		}
-		w.cond.Wait()
-		if w.closed {
-			return nil, ErrWrappedIndexerClosed
-		}
-	}
-	return w.internal, nil
-}
-
-// Ping checks if elastic is available
-func (w *wrappedIndexer) Ping() bool {
-	indexer, err := w.get()
-	if err != nil {
-		log.Warn("Failed to get indexer: %v", err)
-		return false
-	}
-	return indexer.Ping()
-}
-
-func (w *wrappedIndexer) Index(ctx context.Context, repo *repo_model.Repository, sha string, changes *repoChanges) error {
-	indexer, err := w.get()
-	if err != nil {
-		return err
-	}
-	return indexer.Index(ctx, repo, sha, changes)
-}
-
-func (w *wrappedIndexer) Delete(repoID int64) error {
-	indexer, err := w.get()
-	if err != nil {
-		return err
-	}
-	return indexer.Delete(repoID)
-}
-
-func (w *wrappedIndexer) Search(ctx context.Context, repoIDs []int64, language, keyword string, page, pageSize int, isMatch bool) (int64, []*SearchResult, []*SearchResultLanguages, error) {
-	indexer, err := w.get()
-	if err != nil {
-		return 0, nil, nil, err
-	}
-	return indexer.Search(ctx, repoIDs, language, keyword, page, pageSize, isMatch)
-}
-
-func (w *wrappedIndexer) Close() {
-	w.lock.Lock()
-	defer w.lock.Unlock()
-	if w.closed {
-		return
-	}
-	w.closed = true
-	w.cond.Broadcast()
-	if w.internal != nil {
-		w.internal.Close()
-	}
-}