code: @BetaApi(
        "The surface for long-running operations is not stable yet and may change in the future.")
    public final OperationFuture<AsyncBatchAnnotateImagesResponse, OperationMetadata>
        asyncBatchAnnotateImagesAsync(
            List<AnnotateImageRequest> requests, OutputConfig outputConfig) {
  
      AsyncBatchAnnotateImagesRequest request =
          AsyncBatchAnnotateImagesRequest.newBuilder()
              .addAllRequests(requests)
              .setOutputConfig(outputConfig)
              .build();
      return asyncBatchAnnotateImagesAsync(request);
    }
docs: Run asynchronous image detection and annotation for a list of images.
  
  <p>Progress and results can be retrieved through the `google.longrunning.Operations` interface.
  `Operation.metadata` contains `OperationMetadata` (metadata). `Operation.response` contains
  `AsyncBatchAnnotateImagesResponse` (results).
  
  <p>This service will write image annotation outputs to json files in customer GCS bucket, each
  json file containing BatchAnnotateImagesResponse proto.
  
  <p>Sample code:
  
  <pre><code>
  try (ImageAnnotatorClient imageAnnotatorClient = ImageAnnotatorClient.create()) {
  List&lt;AnnotateImageRequest&gt; requests = new ArrayList&lt;&gt;();
  OutputConfig outputConfig = OutputConfig.newBuilder().build();
  AsyncBatchAnnotateImagesResponse response = imageAnnotatorClient.asyncBatchAnnotateImagesAsync(requests, outputConfig).get();
  }
  </code></pre>
  
  @param requests Individual image annotation requests for this batch.
  @param outputConfig Required. The desired output location and metadata (e.g. format).
  @throws com.google.api.gax.rpc.ApiException if the remote call fails