private com.google.protobuf.MapField<
          java.lang.String, com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata>
      internalGetTranscriptionMetadata() {
    if (transcriptionMetadata_ == null) {
      return com.google.protobuf.MapField.emptyMapField(
          TranscriptionMetadataDefaultEntryHolder.defaultEntry);
    }
    return transcriptionMetadata_;
  }
<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