@Override
  public OperationCallable<DeleteModelRequest, Empty, DeleteModelMetadata>
      deleteModelOperationCallable() {
    return deleteModelOperationCallable;
  }
Constructs an instance of GrpcTranslationServiceStub, 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-translate/google-cloud-translate/src/main/java/com/google/cloud/translate/v3/stub/GrpcTranslationServiceStub.java