@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(1, getPhraseSet());
    }
    if (((bitField0_ & 0x00000002) != 0)) {
      output.writeMessage(2, getUpdateMask());
    }
    getUnknownFields().writeTo(output);
  }
<pre>
The list of fields to be updated.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2;</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/UpdatePhraseSetRequest.java