public Builder addFiles(
        int index, com.google.cloud.speech.v2.BatchRecognizeFileMetadata value) {
      if (filesBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureFilesIsMutable();
        files_.add(index, value);
        onChanged();
      } else {
        filesBuilder_.addMessage(index, value);
      }
      return this;
    }
<pre>
Audio files with file metadata for ASR.
The maximum number of files allowed to be specified is 15.
</pre>

<code>repeated .google.cloud.speech.v2.BatchRecognizeFileMetadata files = 3;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/BatchRecognizeRequest.java