private void maybeForceBuilderInitialization() {
      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
        getNetworkConfigFieldBuilder();
        getNetworkConfigsFieldBuilder();
        getServiceAccountFieldBuilder();
        getCreateTimeFieldBuilder();
        getSchedulingConfigFieldBuilder();
        getNetworkEndpointsFieldBuilder();
        getDataDisksFieldBuilder();
        getSymptomsFieldBuilder();
        getAcceleratorConfigFieldBuilder();
        getShieldedInstanceConfigFieldBuilder();
        getBootDiskConfigFieldBuilder();
        getUpcomingMaintenanceFieldBuilder();
      }
    }
<pre>
A TPU instance.
</pre>

Protobuf type {@code google.cloud.tpu.v2alpha1.Node}
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/Node.java