@Override
    public void add(DeleteRequest... deleteRequests) {
        Collections.addAll(bufferedRequests, deleteRequests);
    }
Implementation of a {@link RequestIndexer} that buffers {@link ActionRequest ActionRequests}
before re-sending them to the Elasticsearch cluster upon request.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/elasticsearch-base/src/main/java/org/apache/inlong/sort/elasticsearch/BufferingNoOpRequestIndexer.java