@Override
  public OperationCallable<PurgeProductsRequest, Empty, BatchOperationMetadata>
      purgeProductsOperationCallable() {
    return purgeProductsOperationCallable;
  }
Constructs an instance of GrpcProductSearchStub, 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/v1/stub/GrpcProductSearchStub.java