i found out at ElasticsearchIndexWorkVisitor class line 213 is causing the issue above while indexing datas; i modify "Index index = new Index.Builder( source )" to "Index index = new Index.Builder( source.toString() )" that everthing is working fine, so i just temporarily fix this by overriding ElasticsearchIndexWorkVisitor class in my project; if this is a problem so i just wanna tell your communnity.