private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.EventUpdate,
            com.google.cloud.visionai.v1.EventUpdate.Builder,
            com.google.cloud.visionai.v1.EventUpdateOrBuilder>
        getEventUpdateFieldBuilder() {
      if (eventUpdateBuilder_ == null) {
        if (!(responseCase_ == 1)) {
          response_ = com.google.cloud.visionai.v1.EventUpdate.getDefaultInstance();
        }
        eventUpdateBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.EventUpdate,
                com.google.cloud.visionai.v1.EventUpdate.Builder,
                com.google.cloud.visionai.v1.EventUpdateOrBuilder>(
                (com.google.cloud.visionai.v1.EventUpdate) response_,
                getParentForChildren(),
                isClean());
        response_ = null;
      }
      responseCase_ = 1;
      onChanged();
      return eventUpdateBuilder_;
    }
<pre>
The event update message.
</pre>

<code>.google.cloud.visionai.v1.EventUpdate event_update = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ReceiveEventsResponse.java