@java.lang.Override
  public com.google.protobuf.FieldMask getUpdateMask() {
    return updateMask_ == null ? com.google.protobuf.FieldMask.getDefaultInstance() : updateMask_;
  }
<pre>
Optional. Field mask is used to specify the fields to be overwritten in the
Draft resource by the update.
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. If the
user does not provide a mask then all fields will be overwritten.
</pre>

<code>.google.protobuf.FieldMask update_mask = 1 [(.google.api.field_behavior) = OPTIONAL];
</code>

@return The updateMask.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UpdateDraftRequest.java