final Set<String> subRoleSet = new HashSet<>();
        final Set<String> sAMAccountGroupNameSet = new HashSet<>();
        search(bindDn, filter, new String[] { fessConfig.getLdapMemberofAttribute() }, () -> ldapUser.getEnvironment(), result -> {
            processSearchRoles(result, entryDn -> {
                final String roleName = getSearchRoleName(entryDn);
                final String roleType = updateSearchRoles(roleSet, entryDn, roleName);