@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    com.google.protobuf.GeneratedMessageV3.serializeStringMapTo(
        output,
        internalGetTranscriptionMetadata(),
        TranscriptionMetadataDefaultEntryHolder.defaultEntry,
        1);
    getUnknownFields().writeTo(output);
  }
<pre>
Map from provided filename to the transcription metadata for that file.
</pre>

<code>
map&lt;string, .google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata&gt; transcription_metadata = 1;
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/BatchRecognizeMetadata.java