public Builder setUpdateMask(com.google.protobuf.FieldMask value) {
      if (updateMaskBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        updateMask_ = value;
      } else {
        updateMaskBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Required. Mask of fields from [Node][Tpu.Node] to update.
Supported fields: [description, tags, labels, metadata,
network_config.enable_external_ips].
</pre>

<code>.google.protobuf.FieldMask update_mask = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/UpdateNodeRequest.java