@SuppressWarnings({"rawtypes"})
    protected com.google.protobuf.MapFieldReflectionAccessor internalGetMutableMapFieldReflection(
        int number) {
      switch (number) {
        case 1:
          return internalGetMutableTranscriptionMetadata();
        default:
          throw new RuntimeException("Invalid map field number: " + number);
      }
    }
<pre>
Operation metadata for
[BatchRecognize][google.cloud.speech.v2.Speech.BatchRecognize].
</pre>

Protobuf type {@code google.cloud.speech.v2.BatchRecognizeMetadata}
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/BatchRecognizeMetadata.java