// ===================================================================================
    // Attribute
    // =========
    /** The search helper for performing search operations. */
    @Resource
    protected SearchHelper searchHelper;

    /** The search engine client for interacting with OpenSearch. */
    @Resource
    protected SearchEngineClient searchEngineClient;

		<postConstruct name="addQueryRescorer">
			<arg>
				<component class="org.codelibs.fess.score.LtrQueryRescorer" />
			</arg>
		</postConstruct>
	</component>
	<component name="searchHelper" class="org.codelibs.fess.helper.SearchHelper">
	</component>
	<component name="suggestHelper" class="org.codelibs.fess.helper.SuggestHelper">
	</component>
	<component name="themeHelper" class="org.codelibs.fess.helper.ThemeHelper">

    /** Helper for building and parsing search queries. */
    @Resource
    protected QueryHelper queryHelper;

    /** Helper for executing search operations. */
    @Resource
    protected SearchHelper searchHelper;

    /** HTTP servlet request for accessing request parameters. */
    @Resource
    protected HttpServletRequest request;

    /** Current form reference for rendering extra fields on the edit page. */

        try {
            return facetCache.get(query + "\n" + permissionKey, () -> {
                final SearchHelper searchHelper = ComponentUtil.getSearchHelper();
                final SearchForm params = new SearchForm() {
                    @Override
                    public int getPageSize() {
                        return 0;

        if (isLoginRequired()) {
            return redirectToLogin();
        }

        final Map<String, Object> doc =
                searchHelper.getDocumentByDocId(form.docId, queryFieldConfig.getResponseFields(), getUserBean()).orElse(null);
        final String url = DocumentUtil.getValue(doc, fessConfig.getIndexFieldThumbnail(), String.class);

        if (isLoginRequired()) {
            return redirectToLogin();
        }

        Map<String, Object> doc = null;
        try {
            doc = searchHelper.getDocumentByDocId(form.docId, queryFieldConfig.getCacheResponseFields(), getUserBean()).orElse(null);
        } catch (final Exception e) {
            logger.warn("Failed to request: {}", form.docId, e);
        }

            form.q = null;
            return redirectToRoot();
        }

        try {
            buildFormParams(form);
            form.lang = searchHelper.getLanguages(request, form);
            final WebRenderData renderData = new WebRenderData();
            searchHelper.search(form, renderData, getUserBean());
            return asHtml(virtualHost(path_SearchJsp)).renderWith(data -> {
                if (form.hasConditionQuery()) {

     *         or empty if no search parameters were found
     */
    protected OptionalThing<HtmlResponse> redirectToSearchPage() {
        final RequestParameter[] searchParameters = searchHelper.getSearchParameters();
        if (searchParameters.length > 0) {
            final List<String> paramList = new ArrayList<>();
            for (final RequestParameter param : searchParameters) {