});

        // update pager
        BeanUtil.copyBeanToBean(userList, userPager, option -> option.include(Constants.PAGER_CONVERSION_RULE));
        userPager.setPageNumberList(userList.pageRange(op -> {
            op.rangeSize(fessConfig.getPagingPageRangeSizeAsInteger());
        }).createPageNumberList());

        return userList;
    }

    /**
     * Retrieves a user by their unique identifier.