public com.google.protobuf.FieldMask.Builder getUpdateMaskBuilder() {
      bitField0_ |= 0x00000002;
      onChanged();
      return getUpdateMaskFieldBuilder().getBuilder();
    }
<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