.ifPresent(s -> entry.put(new BasicAttribute(fessConfig.getLdapAttrGidNumber(), s)));
    }

    public void validateGroupAttributes(final Class<?> type, final Map<String, String> attributes, final Consumer<String> consumer) {
        if (type == Long.class) {
            // Long type attributes
            final String attrGidNumber = fessConfig.getLdapAttrGidNumber();

            Stream.of(attrGidNumber)