* Generates hidden HTML form fields for geographic filtering.
     *
     * @return HTML string containing hidden input fields for geographic parameters
     */
    public static String geoForm() {
        return createForm(Constants.GEO_FORM, GEO_PREFIX);
    }

    /**
     * Retrieves the list of facet query view objects for display.
     *
     * @return list of FacetQueryView objects
     */

    /** View parameter for facet form data. */
    public static final String FACET_FORM = "fess.FacetForm";

    /** View parameter for geo form data. */
    public static final String GEO_FORM = "fess.GeoForm";

    /** View parameter for label value mapping. */
    public static final String LABEL_VALUE_MAP = "fess.LabelValueMap";

    /** Query parameter name for main search query. */

     * @return action response for redirection or content streaming
     * @throws IOException if an I/O error occurs during content retrieval
     */
    @Execute
    public ActionResponse index(final GoForm form) throws IOException {
        validate(form, messages -> {}, () -> asHtml(virtualHost(path_Error_ErrorJsp)));
        if (isLoginRequired()) {
            return redirectToLogin();
        }