private ClientResponse buildOffsetFetchClientResponseDisconnected(
        final NetworkClientDelegate.UnsentRequest request) {
        return buildOffsetFetchClientResponse(request, Collections.emptyMap(), Errors.NONE, true);
    }
@return Retriable coordinator errors and a boolean indicating if it is expected to mark
the coordinator unknown when the error occurs.
clients/src/test/java/org/apache/kafka/clients/consumer/internals/CommitRequestManagerTest.java