return client.prepareExplain(index, id);
    }

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

    @Override
    public void explain(final ExplainRequest request, final ActionListener<ExplainResponse> listener) {
        client.explain(request, listener);
    }

    @Override