public Builder clearUpdateMask() {
      bitField0_ = (bitField0_ & ~0x00000001);
      updateMask_ = null;
      if (updateMaskBuilder_ != null) {
        updateMaskBuilder_.dispose();
        updateMaskBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Field mask is used to specify the fields to be overwritten in the Pool
resource by the update. You can only update the following fields:

* `networkConfig`

The fields specified in the update_mask are relative to the resource, not
the full request. A field will be overwritten if it is in the mask.
</pre>

<code>.google.protobuf.FieldMask update_mask = 1;</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/UpdatePoolRequest.java