if (!labelTypeItems.isEmpty() && !form.fields.containsKey(FessSearchAction.LABEL_FIELD)) {
            final String[] defaultLabelValues = fessConfig.getDefaultLabelValues(getUserBean());
            if (defaultLabelValues.length > 0) {
                form.fields.put(FessSearchAction.LABEL_FIELD, defaultLabelValues);
            }
        }

    }

    default String getDefaultSortValue() {
        return getSystemProperty(Constants.DEFAULT_SORT_VALUE_PROPERTY, StringUtil.EMPTY);
    }

    default String[] getDefaultLabelValues(final OptionalThing<FessUserBean> userBean) {
        @SuppressWarnings("unchecked")
        Map<String, List<String>> map = (Map<String, List<String>>) propMap.get(DEFAULT_LABEL_VALUES);
        if (map == null) {