// attributes
        search(fessConfig.getLdapAdminUserBaseDn(), fessConfig.getLdapAdminUserFilter(user.getName()), null, adminEnv, result -> {
            if (!result.isEmpty()) {
                modifyUserAttributes(user, adminEnv, userDN, result);
            } else {
                final BasicAttributes entry = new BasicAttributes();
                addUserAttributes(entry, user);