Explicitly not update indexes when sync database schemas (#34281)

Fix #34275

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/migrations/v1_23/v311.go

@@ -11,6 +11,9 @@ func AddTimeEstimateColumnToIssueTable(x *xorm.Engine) error {
 	type Issue struct {
 		TimeEstimate int64 `xorm:"NOT NULL DEFAULT 0"`
 	}
-
-	return x.Sync(new(Issue))
+	_, err := x.SyncWithOptions(xorm.SyncOptions{
+		IgnoreConstrains: true,
+		IgnoreIndices:    true,
+	}, new(Issue))
+	return err
 }