* Retrieves and deserializes search parameters from browser cookies.
     *
     * @return Array of request parameters from the cookie, or empty array if none found
     */
    public RequestParameter[] getSearchParameters() {
        return LaRequestUtil.getOptionalRequest().map(req -> {
            final FessConfig fessConfig = ComponentUtil.getFessConfig();
            final String cookieName = fessConfig.getCookieSearchParameterName();

     *         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) {