public com.google.common.util.concurrent.ListenableFuture<com.google.protobuf.Empty>
        addProductToProductSet(
            com.google.cloud.vision.v1p3beta1.AddProductToProductSetRequest request) {
      return io.grpc.stub.ClientCalls.futureUnaryCall(
          getChannel().newCall(getAddProductToProductSetMethod(), getCallOptions()), request);
    }
<pre>
Adds a Product to the specified ProductSet. If the Product is already
present, no change is made.
One Product can be added to at most 100 ProductSets.
Possible errors:
* Returns NOT_FOUND if the Product or the ProductSet doesn't exist.
</pre>
java-vision/grpc-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/ProductSearchGrpc.java