return oc;
    }

    String getLdapAdminUserFilter();

    default String getLdapAdminUserFilter(final String name) {
        return String.format(getLdapAdminUserFilter(), name);
    }

    String getLdapAdminUserBaseDn();

    default String getLdapAdminUserSecurityPrincipal(final String name) {

            return;
        }

        final Supplier<Hashtable<String, String>> adminEnv = this::createAdminEnv;
        search(fessConfig.getLdapAdminUserBaseDn(), fessConfig.getLdapAdminUserFilter(user.getName()), null, adminEnv, result -> {
            if (!result.isEmpty()) {
                setAttributeValue(result, fessConfig.getLdapAttrSurname(), o -> user.setSurname(o.toString()));