if (!result.isEmpty()) {
                setAttributeValue(result, fessConfig.getLdapAttrSurname(), o -> user.setSurname(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrGivenName(), o -> user.setGivenName(o.toString()));
                setAttributeValue(result, fessConfig.getLdapAttrMail(), o -> user.setMail(o.toString()));

     * The value is, e.g. givenName <br>
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getLdapAttrGivenName();

    /**
     * Get the value for the key 'ldap.attr.employeeNumber'. <br>
     * The value is, e.g. employeeNumber <br>