code: public BulkRequestBuilder buildBulkIndexRequestBuilder(
              List<IndexRequestBuilder> indexRequestBuilderList) {
          BulkRequestBuilder bulkRequestBuilder = jmESClient.prepareBulk();
          for (IndexRequestBuilder indexRequestBuilder : indexRequestBuilderList)
              bulkRequestBuilder.add(indexRequestBuilder);
          return bulkRequestBuilder;
      }
docs: Build bulk index request builder bulk request builder.
  
  @param indexRequestBuilderList the index request builder list
  @return the bulk request builder