@Override
  public OperationCallable<BatchRecognizeRequest, BatchRecognizeResponse, OperationMetadata>
      batchRecognizeOperationCallable() {
    return batchRecognizeOperationCallable;
  }
Constructs an instance of HttpJsonSpeechStub, 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-speech/google-cloud-speech/src/main/java/com/google/cloud/speech/v2/stub/HttpJsonSpeechStub.java