.forEach(v -> modifyDeleteEntry(modifyList, attrPreferredLanguage, v)));
        final String attrDepartmentNumber = fessConfig.getLdapAttrDepartmentNumber();
        OptionalUtil.ofNullable(user.getDepartmentNumber()).filter(StringUtil::isNotBlank)
                .ifPresent(s -> modifyReplaceEntry(modifyList, attrDepartmentNumber, s))
                .orElse(() -> getAttributeValueList(result, attrDepartmentNumber).stream()