@java.lang.Override
  public final boolean isInitialized() {
    byte isInitialized = memoizedIsInitialized;
    if (isInitialized == 1) return true;
    if (isInitialized == 0) return false;

    memoizedIsInitialized = 1;
    return true;
  }
<pre>
Optional. Idempotent request UUID.
</pre>

<code>string request_id = 4 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for requestId.
java-tpu/proto-google-cloud-tpu-v2/src/main/java/com/google/cloud/tpu/v2/CreateQueuedResourceRequest.java