Fix nil checking on typed interface (#17598)

* Fix nil checking on typed interface

- Partially resoles #17596
- Resolves SA4023 errors.
- Ensure correctly that typed interface are nil.

* Remove unnecessary code

`NewBleveIndexer` will never return nil, even on errors.

* Patch `NewBleveIndexer`

* Fix low-level functions

* Remove deadcode

* Fix GetSession

* Close Elastic search when err isn't nil

* Update elastic_search.go

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

modules/indexer/code/bleve.go

@@ -173,6 +173,10 @@ func NewBleveIndexer(indexDir string) (*BleveIndexer, bool, error) {
 		indexDir: indexDir,
 	}
 	created, err := indexer.init()
+	if err != nil {
+		indexer.Close()
+		return nil, false, err
+	}
 	return indexer, created, err
 }