/**
     * Parameter to control tracking of total hits in search results.
     */
    @Size(max = 100)
    public String track_total_hits;

    /**
     * Default constructor for SearchForm.
     */
    public SearchForm() {
        super();
    }

    // advance

    @Override
    public int getStartPosition() {
        if (start == null) {

     *
     * @param form the search form
     * @return HTML response for the index page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        validate(form, messages -> {}, this::asDictIndexHtml);
        stopwordsPager.clear();
        return asHtml(path_AdminDictStopwords_AdminDictStopwordsJsp).renderWith(data -> {

     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            dataConfigPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            dataConfigPager.setCurrentPageNumber(0);
        });

    /**
     * Show the index page.
     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        validate(form, messages -> {}, this::asDictIndexHtml);
        charMappingPager.clear();
        return asHtml(path_AdminDictMapping_AdminDictMappingJsp).renderWith(data -> {

     * @return HTML response with the user list
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            userPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            userPager.setCurrentPageNumber(0);
        });

    /**
     * Show the index page.
     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        validate(form, messages -> {}, this::asDictIndexHtml);
        protwordsPager.clear();
        return asHtml(path_AdminDictProtwords_AdminDictProtwordsJsp).renderWith(data -> {

     * @param form the search form
     * @return HTML response for the list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse list(final OptionalThing<Integer> pageNumber, final SearchForm form) {
        pageNumber.ifPresent(num -> {
            groupPager.setCurrentPageNumber(pageNumber.get());
        }).orElse(() -> {
            groupPager.setCurrentPageNumber(0);
        });

     *
     * @param form the search form for filtering
     * @return HTML response for the web config list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse index(final SearchForm form) {
        return asListHtml();
    }

    /**
     * Displays a paginated list of web crawler configurations.
     *
     * @param pageNumber the page number to display (optional)

     * @return The HTML response.
     */
    @Execute
    public HtmlResponse index(final SearchForm form) {
        return search(form);
    }

    /**
     * The advance search page.
     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    public HtmlResponse advance(final SearchForm form) {
        if (isLoginRequired()) {
            return redirectToLogin();
        }

     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse list(final Integer pageNumber, final SearchForm form) {
        saveToken();
        crawlingInfoPager.setCurrentPageNumber(pageNumber);
        return asHtml(path_AdminCrawlinginfo_AdminCrawlinginfoJsp).renderWith(data -> {
            searchPaging(data, form);