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()));

     * The value is, e.g. uid=%s <br>
     * comment: User filter for LDAP admin.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapAdminUserFilter();

    /**
     * Get the value for the key 'ldap.admin.user.base.dn'. <br>
     * The value is, e.g. ou=People,dc=fess,dc=codelibs,dc=org <br>
     * comment: Base DN for LDAP admin user.