@Override
  public OperationCallable<
          AsyncBatchAnnotateFilesRequest, AsyncBatchAnnotateFilesResponse, OperationMetadata>
      asyncBatchAnnotateFilesOperationCallable() {
    return asyncBatchAnnotateFilesOperationCallable;
  }
Constructs an instance of GrpcImageAnnotatorStub, 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-vision/google-cloud-vision/src/main/java/com/google/cloud/vision/v1p3beta1/stub/GrpcImageAnnotatorStub.java