@java.lang.Override
  public boolean hasUpdateMask() {
    return ((bitField0_ & 0x00000001) != 0);
  }
<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>

@return Whether the updateMask field is set.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/UpdateNodeRequest.java