public Builder setUpdateMask(com.google.protobuf.FieldMask value) {
      if (updateMaskBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        updateMask_ = value;
      } else {
        updateMaskBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
The list of fields to be updated.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2;</code>
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/UpdatePhraseSetRequest.java