public Builder setUpdateMask(com.google.protobuf.FieldMask.Builder builderForValue) {
      if (updateMaskBuilder_ == null) {
        updateMask_ = builderForValue.build();
      } else {
        updateMaskBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Required. The list of fields to update. Update mask supports a special
value `*` which fully replaces (equivalent to PUT) the resource provided.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-telcoautomation/proto-google-cloud-telcoautomation-v1alpha1/src/main/java/com/google/cloud/telcoautomation/v1alpha1/UpdateHydratedDeploymentRequest.java