public java.lang.String getServiceAccount() {
      java.lang.Object ref = serviceAccount_;
      if (!(ref instanceof java.lang.String)) {
        com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        serviceAccount_ = s;
        return s;
      } else {
        return (java.lang.String) ref;
      }
    }
<pre>
Output only. The service account used to run the tensor flow services
within the node. To share resources, including Google Cloud Storage data,
with the Tensorflow job running in the Node, this account must have
permissions to that data.
</pre>

<code>string service_account = 15 [(.google.api.field_behavior) = OUTPUT_ONLY];</code>

@return The serviceAccount.
java-tpu/proto-google-cloud-tpu-v1/src/main/java/com/google/cloud/tpu/v1/Node.java