// sort
        if (StringUtil.isBlank(form.sort)) {
            final String[] defaultSortValues = fessConfig.getDefaultSortValues(getUserBean());
            if (defaultSortValues.length == 1) {
                form.sort = defaultSortValues[0];
            } else if (defaultSortValues.length >= 2) {
                final StringBuilder sortValueSb = new StringBuilder();

    String GROUP_VALUE_PREFIX = "group:";

    String ROLE_VALUE_PREFIX = "role:";

    String APP_VALUES = "appValues";

    String DEFAULT_SORT_VALUES = "defaultSortValues";

    String DEFAULT_LABEL_VALUES = "defaultLabelValues";

    String VIRTUAL_HOST_VALUES = "virtualHostValues";

    String QUERY_LANGUAGE_MAPPING = "queryLanguageMapping";