private com.google.protobuf.MapFieldBuilder<
            java.lang.String,
            com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadataOrBuilder,
            com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata,
            com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata.Builder>
        internalGetTranscriptionMetadata() {
      if (transcriptionMetadata_ == null) {
        return new com.google.protobuf.MapFieldBuilder<>(transcriptionMetadataConverter);
      }
      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