public Builder clearUpdateMask() {
      bitField0_ = (bitField0_ & ~0x00000001);
      updateMask_ = null;
      if (updateMaskBuilder_ != null) {
        updateMaskBuilder_.dispose();
        updateMaskBuilder_ = null;
      }
      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-v2/src/main/java/com/google/cloud/tpu/v2/UpdateNodeRequest.java