@Execute
    public HtmlResponse index(final SearchForm form) {
        return search(form);
    }

    @Execute
    public HtmlResponse advance(final SearchForm form) {
        if (isLoginRequired()) {
            return redirectToLogin();
        }
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_IndexJsp)).renderWith(data -> {

    /** The key of the message: Advance */
    public static final String LABELS_ADVANCE = "{labels.advance}";

    /** The key of the message: Advanced Search */
    public static final String LABELS_advance_search_title = "{labels.advance_search_title}";

    /** The key of the message: All these words */
    public static final String LABELS_advance_search_must_queries = "{labels.advance_search_must_queries}";

    public static final String NOTIFICATION_LOGIN = "notification.login";

    public static final String NOTIFICATION_SEARCH_TOP = "notification.search.top";

    public static final String NOTIFICATION_ADVANCE_SEARCH = "notification.advance.search";

    public static final String STORAGE_ENDPOINT = "storage.endpoint";

    public static final String STORAGE_ACCESS_KEY = "storage.accesskey";

    HtmlNext path_AdminWizard_AdminWizardStartJsp = new HtmlNext("/admin/wizard/admin_wizard_start.jsp");

    /** The path of the HTML: /advance.jsp */
    HtmlNext path_AdvanceJsp = new HtmlNext("/advance.jsp");

    /** The path of the HTML: /error/badRequest.jsp */
    HtmlNext path_Error_BadRequestJsp = new HtmlNext("/error/badRequest.jsp");

    public Integer offset;

    @ValidateTypeFailure
    public Integer pn;

    @Size(max = 1000)
    public String sdh;

    @Size(max = 100)
    public String track_total_hits;

    // advance

    @Override
    public int getStartPosition() {
        if (start == null) {
            start = ComponentUtil.getFessConfig().getPagingSearchPageStartAsInteger();
        }
        return start;
    }

        final ExceptionMessageBuilder br = new ExceptionMessageBuilder();
        br.addNotice("Too long boundary size so treats it as 404.");
        br.addItem("Advice");
        br.addElement("Against for JVN14876762.");
        br.addElement("Boundary size is limited by Framework.");
        br.addElement("Too long boundary is treated as 404 because it's thought of as attack.");

        return getSystemProperty(Constants.NOTIFICATION_LOGIN, StringUtil.EMPTY);
    }

    default String getNotificationAdvanceSearch() {
        return getSystemProperty(Constants.NOTIFICATION_ADVANCE_SEARCH, StringUtil.EMPTY);
    }

    default void setNotificationSearchTop(final String value) {
        setSystemProperty(Constants.NOTIFICATION_SEARCH_TOP, value);
    }