public boolean hasServiceAccount() {
      return ((bitField0_ & 0x00000200) != 0);
    }
<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.v2alpha1.ServiceAccount service_account = 37;</code>

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