* Retrieves a list of all available users in the system.
     * Returns up to the maximum configured number of users.
     *
     * @return a list of all available users
     */
    public List<User> getAvailableUserList() {
        return userBhv.selectList(cb -> {
            cb.query().matchAll();
            cb.fetchFirst(fessConfig.getPageUserMaxFetchSizeAsInteger());
        });
    }