default void deleteReferenceImage(
        com.google.cloud.vision.v1p3beta1.DeleteReferenceImageRequest request,
        io.grpc.stub.StreamObserver<com.google.protobuf.Empty> responseObserver) {
      io.grpc.stub.ServerCalls.asyncUnimplementedUnaryCall(
          getDeleteReferenceImageMethod(), responseObserver);
    }
<pre>
Permanently deletes a reference image.
The image metadata will be deleted right away, but search queries
against ProductSets containing the image may still work until all related
caches are refreshed.
The actual image files are not deleted from Google Cloud Storage.
Possible errors:
* Returns NOT_FOUND if the reference image does not exist.
</pre>
java-vision/grpc-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/ProductSearchGrpc.java