code: public <T> List<T> mgetDocuments(String path,String entity,Class<T> type)  throws ElasticSearchException{
  		MGetDocs searchResult = (MGetDocs) this.client.executeRequest(path,entity,   new MGetDocumentsSourceResponseHandler( type),ClientUtil.HTTP_POST);
  
  		return ResultUtil.buildObjects(searchResult, type);
  	}
docs: https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-multi-get.html
  @param path _mget
  test/_mget
  test/type/_mget
  test/type/_mget?stored_fields=field1,field2
  _mget?routing=key1
  @param entity
  @param type
  @param <T>
  @return
  @throws ElasticSearchException