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/elastic_search.go

@@ -82,7 +82,10 @@ func NewElasticSearchIndexer(url, indexerName string) (*ElasticSearchIndexer, bo
 		indexerAliasName: indexerName,
 	}
 	exists, err := indexer.init()
-
+	if err != nil {
+		indexer.Close()
+		return nil, false, err
+	}
 	return indexer, !exists, err
 }