Support elastic search for code search (#10273)

* Support elastic search for code search

* Finished elastic search implementation and add some tests

* Enable test on drone and added docs

* Add new fields to elastic search

* Fix bug

* remove unused changes

* Use indexer alias to keep the gitea indexer version

* Improve codes

* Some code improvements

* The real indexer name changed to xxx.v1

Co-authored-by: zeripath <art27@cantab.net>

modules/indexer/code/bleve_test.go

@@ -6,21 +6,15 @@ package code
 
 import (
 	"io/ioutil"
-	"path/filepath"
 	"testing"
 
 	"code.gitea.io/gitea/models"
-	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"
 
 	"github.com/stretchr/testify/assert"
 )
 
-func TestMain(m *testing.M) {
-	models.MainTest(m, filepath.Join("..", "..", ".."))
-}
-
-func TestIndexAndSearch(t *testing.T) {
+func TestBleveIndexAndSearch(t *testing.T) {
 	models.PrepareTestEnv(t)
 
 	dir, err := ioutil.TempDir("", "bleve.index")
@@ -31,10 +25,9 @@ func TestIndexAndSearch(t *testing.T) {
 	}
 	defer util.RemoveAll(dir)
 
-	setting.Indexer.RepoIndexerEnabled = true
 	idx, _, err := NewBleveIndexer(dir)
 	if err != nil {
-		assert.Fail(t, "Unable to create indexer Error: %v", err)
+		assert.Fail(t, "Unable to create bleve indexer Error: %v", err)
 		if idx != nil {
 			idx.Close()
 		}
@@ -42,45 +35,5 @@ func TestIndexAndSearch(t *testing.T) {
 	}
 	defer idx.Close()
 
-	err = idx.Index(1)
-	assert.NoError(t, err)
-
-	var (
-		keywords = []struct {
-			Keyword string
-			IDs     []int64
-			Langs   int
-		}{
-			{
-				Keyword: "Description",
-				IDs:     []int64{1},
-				Langs:   1,
-			},
-			{
-				Keyword: "repo1",
-				IDs:     []int64{1},
-				Langs:   1,
-			},
-			{
-				Keyword: "non-exist",
-				IDs:     []int64{},
-				Langs:   0,
-			},
-		}
-	)
-
-	for _, kw := range keywords {
-		total, res, langs, err := idx.Search(nil, "", kw.Keyword, 1, 10)
-		assert.NoError(t, err)
-		assert.EqualValues(t, len(kw.IDs), total)
-
-		assert.NotNil(t, langs)
-		assert.Len(t, langs, kw.Langs)
-
-		var ids = make([]int64, 0, len(res))
-		for _, hit := range res {
-			ids = append(ids, hit.RepoID)
-		}
-		assert.EqualValues(t, kw.IDs, ids)
-	}
+	testIndexer("beleve", t, idx)
 }