public Builder clearControl() {
      if (controlBuilder_ == null) {
        if (responseCase_ == 2) {
          responseCase_ = 0;
          response_ = null;
          onChanged();
        }
      } else {
        if (responseCase_ == 2) {
          responseCase_ = 0;
          response_ = null;
        }
        controlBuilder_.clear();
      }
      return this;
    }
<pre>
A control message from the server.
</pre>

<code>.google.cloud.visionai.v1.ReceiveEventsControlResponse control = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ReceiveEventsResponse.java