public Builder clearRequestId() {
      requestId_ = getDefaultInstance().getRequestId();
      bitField0_ = (bitField0_ & ~0x00000008);
      onChanged();
      return this;
    }
<pre>
Idempotent request UUID.
</pre>

<code>string request_id = 4;</code>

@return This builder for chaining.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/CreateQueuedResourceRequest.java