@Override
    public MultiSearchRequestBuilder prepareMultiSearch() {
        return client.prepareMultiSearch();
    }

    @Override
    public ExplainRequestBuilder prepareExplain(final String index, final String id) {
        return client.prepareExplain(index, id);
    }

    @Override
    public ActionFuture<ExplainResponse> explain(final ExplainRequest request) {
        return client.explain(request);
    }

     * @param index the index name
     * @param id    the document ID
     * @return the explain request builder
     */
    @Override
    public ExplainRequestBuilder prepareExplain(final String index, final String id) {
        return client.prepareExplain(index, id);
    }

    /**
     * Executes an explain request asynchronously.
     *
     * @param request the explain request