public com.google.protobuf.FieldMaskOrBuilder getUpdateMaskOrBuilder() {
      if (updateMaskBuilder_ != null) {
        return updateMaskBuilder_.getMessageOrBuilder();
      } else {
        return updateMask_ == null
            ? com.google.protobuf.FieldMask.getDefaultInstance()
            : updateMask_;
      }
    }
<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