@java.lang.Override
  public int hashCode() {
    if (memoizedHashCode != 0) {
      return memoizedHashCode;
    }
    int hash = 41;
    hash = (19 * hash) + getDescriptor().hashCode();
    hash = (37 * hash) + INTERACTION_TYPE_FIELD_NUMBER;
    hash = (53 * hash) + interactionType_;
    hash = (37 * hash) + INDUSTRY_NAICS_CODE_OF_AUDIO_FIELD_NUMBER;
    hash = (53 * hash) + getIndustryNaicsCodeOfAudio();
    hash = (37 * hash) + MICROPHONE_DISTANCE_FIELD_NUMBER;
    hash = (53 * hash) + microphoneDistance_;
    hash = (37 * hash) + ORIGINAL_MEDIA_TYPE_FIELD_NUMBER;
    hash = (53 * hash) + originalMediaType_;
    hash = (37 * hash) + RECORDING_DEVICE_TYPE_FIELD_NUMBER;
    hash = (53 * hash) + recordingDeviceType_;
    hash = (37 * hash) + RECORDING_DEVICE_NAME_FIELD_NUMBER;
    hash = (53 * hash) + getRecordingDeviceName().hashCode();
    hash = (37 * hash) + ORIGINAL_MIME_TYPE_FIELD_NUMBER;
    hash = (53 * hash) + getOriginalMimeType().hashCode();
    hash = (37 * hash) + AUDIO_TOPIC_FIELD_NUMBER;
    hash = (53 * hash) + getAudioTopic().hashCode();
    hash = (29 * hash) + getUnknownFields().hashCode();
    memoizedHashCode = hash;
    return hash;
  }
<pre>
Description of the content. Eg. "Recordings of federal supreme court
hearings from 2012".
</pre>

<code>string audio_topic = 10;</code>

@return The bytes for audioTopic.
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/RecognitionMetadata.java