public void asyncBatchAnnotateFiles(
        com.google.cloud.vision.v1.AsyncBatchAnnotateFilesRequest request,
        io.grpc.stub.StreamObserver<com.google.longrunning.Operation> responseObserver) {
      io.grpc.stub.ClientCalls.asyncUnaryCall(
          getChannel().newCall(getAsyncBatchAnnotateFilesMethod(), getCallOptions()),
          request,
          responseObserver);
    }
<pre>
Run asynchronous image detection and annotation for a list of generic
files, such as PDF files, which may contain multiple pages and multiple
images per page. Progress and results can be retrieved through the
`google.longrunning.Operations` interface.
`Operation.metadata` contains `OperationMetadata` (metadata).
`Operation.response` contains `AsyncBatchAnnotateFilesResponse` (results).
</pre>
java-vision/grpc-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/ImageAnnotatorGrpc.java