public Builder setServiceAccount(
        com.google.cloud.tpu.v2.ServiceAccount.Builder builderForValue) {
      if (serviceAccountBuilder_ == null) {
        serviceAccount_ = builderForValue.build();
      } else {
        serviceAccountBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000200;
      onChanged();
      return this;
    }
<pre>
The Google Cloud Platform Service Account to be used by the TPU node VMs.
If None is specified, the default compute service account will be used.
</pre>

<code>.google.cloud.tpu.v2.ServiceAccount service_account = 37;</code>
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/Node.java