nonExistentUsers := []string{}
	for _, dn := range userDistNames {
		searchRequest := ldap.NewSearchRequest(
			dn,
			ldap.ScopeBaseObject, ldap.NeverDerefAliases, 0, 0, false,
			filter,
			[]string{}, // only need DN, so pass no attributes here
			nil,
		)

		searchResult, err := conn.Search(searchRequest)
		if err != nil {
			// Object does not exist error?
			if ldap.IsErrorWithCode(err, 32) {

    public ActionFuture<SearchResponse> search(final SearchRequest request) {
        return client.search(request);
    }

    /**
     * Executes a search request asynchronously with a callback.
     *
     * @param request  the search request
     * @param listener the response listener
     */
    @Override
    public void search(final SearchRequest request, final ActionListener<SearchResponse> listener) {