return false;
    }

    public static void deleteIndex(final IndicesAdminClient indicesClient, final String index,
            final Consumer<AcknowledgedResponse> comsumer) {
        indicesClient.prepareDelete(index).execute(new ActionListener<AcknowledgedResponse>() {

            @Override
            public void onResponse(final AcknowledgedResponse response) {
                logger.info("Deleted {} index.", index);

        client.delete(request, listener);
    }

    @Override
    public DeleteRequestBuilder prepareDelete() {
        return client.prepareDelete();
    }

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

    @Override
    public ActionFuture<BulkResponse> bulk(final BulkRequest request) {

        return response.getResult() == Result.DELETED ? 1 : 0;
    }

    protected DeleteRequestBuilder createDeleteRequest(final EsAbstractEntity esEntity) {
        final DeleteRequestBuilder builder = client.prepareDelete().setIndex(asEsIndex()).setId(esEntity.asDocMeta().id());
        final RequestOptionCall<DeleteRequestBuilder> deleteOption = esEntity.asDocMeta().deleteOption();
        if (deleteOption != null) {

        return response.getResult() == Result.DELETED ? 1 : 0;
    }

    protected DeleteRequestBuilder createDeleteRequest(final EsAbstractEntity esEntity) {
        final DeleteRequestBuilder builder = client.prepareDelete().setIndex(asEsIndex()).setId(esEntity.asDocMeta().id());
        final RequestOptionCall<DeleteRequestBuilder> deleteOption = esEntity.asDocMeta().deleteOption();
        if (deleteOption != null) {

        return response.getResult() == Result.DELETED ? 1 : 0;
    }

    protected DeleteRequestBuilder createDeleteRequest(final EsAbstractEntity esEntity) {
        final DeleteRequestBuilder builder = client.prepareDelete().setIndex(asEsIndex()).setId(esEntity.asDocMeta().id());
        final RequestOptionCall<DeleteRequestBuilder> deleteOption = esEntity.asDocMeta().deleteOption();
        if (deleteOption != null) {

    public HtmlResponse clearCrawlerIndex(final ActionForm form) {
        validate(form, messages -> {}, this::asIndexHtml);
        verifyToken(this::asIndexHtml);
        searchEngineClient.admin().indices().prepareDelete(//
                fessConfig.getIndexDocumentCrawlerIndex() + ".queue", //
                fessConfig.getIndexDocumentCrawlerIndex() + ".data", //
                fessConfig.getIndexDocumentCrawlerIndex() + ".filter")