*/
    @Execute
    public ActionResponse index(final GoForm form) throws IOException {
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
        if (isLoginRequired()) {
            return redirectToLogin();
        }

        Map<String, Object> doc = null;
        try {
            doc = searchHelper

     * @param form the form to populate with configuration values
     */
    public static void updateForm(final FessConfig fessConfig, final EditForm form) {
        form.loginRequired = fessConfig.isLoginRequired() ? Constants.TRUE : Constants.FALSE;
        form.resultCollapsed = fessConfig.isResultCollapsed() ? Constants.TRUE : Constants.FALSE;
        form.loginLink = fessConfig.isLoginLinkEnabled() ? Constants.TRUE : Constants.FALSE;

    }

    default void setLoginRequired(final boolean value) {
        setSystemPropertyAsBoolean(Constants.LOGIN_REQUIRED_PROPERTY, value);
    }

    default boolean isLoginRequired() {
        return getSystemPropertyAsBoolean(Constants.LOGIN_REQUIRED_PROPERTY, false);
    }

    default void setResultCollapsed(final boolean value) {