return getComponent(DATA_SERVICE);
    }

    /**
     * Gets the search engine client component.
     * @return The search engine client.
     */
    public static SearchEngineClient getSearchEngineClient() {
        return getComponent(SEARCH_ENGINE_CLIENT);
    }

    /**
     * Gets the Fess configuration component.
     * @return The Fess config.
     */

     * @return A list of documents.
     */
    protected List<Map<String, Object>> getDocumentList(final KeyMatch keyMatch) {
        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return searchEngineClient.getDocumentList(fessConfig.getIndexDocumentSearchIndex(),

        contentFieldList = Arrays.asList(stream(fessConfig.getSuggestFieldContents()).get(stream -> stream.toArray(n -> new String[n])));

        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
        searchEngineClient.admin()
                .cluster()
                .prepareHealth()
                .setWaitForYellowStatus()
                .execute()

        final String query = ComponentUtil.getQueryStringBuilder().params(params).sortField(params.getSort()).build();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return ComponentUtil.getSearchEngineClient()
                .<Map<String, Object>> scrollSearch(fessConfig.getIndexDocumentSearchIndex(), searchRequestBuilder -> {
                    final QueryHelper queryHelper = ComponentUtil.getQueryHelper();

     * @return the number of documents that were deleted
     */
    public long deleteBySessionId(final String sessionId) {
        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String index = fessConfig.getIndexDocumentUpdateIndex();
        return deleteBySessionId(searchEngineClient, index, sessionId);

        // TODO bulk
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        try {
            ComponentUtil.getIndexingHelper()
                    .updateDocument(ComponentUtil.getSearchEngineClient(), thumbnailId, fessConfig.getIndexFieldThumbnail(), value);
        } catch (final Exception e) {
            logger.warn("Failed to update thumbnail field at {}", thumbnailId, e);
        }
    }

    /**

        final long startTime = systemHelper.getCurrentTimeAsLong();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();

        if (logger.isDebugEnabled()) {
            logger.debug("Adding document: url={}", dataMap.get(fessConfig.getIndexFieldUrl()));
        }

        //   required check

     *
     * @return a string containing the execution result or error messages
     */
    public String execute() {
        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        final StringBuilder resultBuf = new StringBuilder();

        final String exportPath = fessConfig.getIndexExportPath();

            final OptionalThing<FessUserBean> userBean) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return ComponentUtil.getSearchEngineClient()
                .search(fessConfig.getIndexDocumentSearchIndex(), createSearchCondition(query, params, userBean),
                        (searchRequestBuilder, execTime, searchResponse) -> {

     * @param runtime The action runtime.
     */
    public void setupAdminHtmlData(final TypicalAction action, final ActionRuntime runtime) {
        runtime.registerData("developmentMode", ComponentUtil.getSearchEngineClient().isEmbedded());
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String installationLink = fessConfig.getOnlineHelpInstallation();