@Override
  public void shutdownNow() {
    backgroundResources.shutdownNow();
  }
Constructs an instance of HttpJsonStorageTransferServiceStub, using the given settings. This is
protected so that it is easy to make a subclass, but otherwise, the static factory methods
should be preferred.
java-storage-transfer/google-cloud-storage-transfer/src/main/java/com/google/storagetransfer/v1/proto/stub/HttpJsonStorageTransferServiceStub.java