public com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata.Builder
        putTranscriptionMetadataBuilderIfAbsent(java.lang.String key) {
      java.util.Map<
              java.lang.String,
              com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadataOrBuilder>
          builderMap = internalGetMutableTranscriptionMetadata().ensureBuilderMap();
      com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadataOrBuilder entry =
          builderMap.get(key);
      if (entry == null) {
        entry = com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata.newBuilder();
        builderMap.put(key, entry);
      }
      if (entry instanceof com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata) {
        entry =
            ((com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata) entry).toBuilder();
        builderMap.put(key, entry);
      }
      return (com.google.cloud.speech.v2.BatchRecognizeTranscriptionMetadata.Builder) entry;
    }
<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