* @return HTML response redirecting to the maintenance page
     */
    @Execute
    @Secured({ ROLE })
    public HtmlResponse reindexConfigIndices(final ActionForm form) {
        validate(form, messages -> {}, this::asIndexHtml);
        verifyToken(this::asIndexHtml);

        final boolean loadBulkData = isCheckboxEnabled(form.loadBulkData);

     * @return true if all targeted indices were rebuilt successfully, false if any index rebuild failed
     */
    public boolean reindexConfigIndices(final boolean loadBulkData, final Set<String> targetPrefixes) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();