private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.Event,
            com.google.cloud.visionai.v1.Event.Builder,
            com.google.cloud.visionai.v1.EventOrBuilder>
        getEventFieldBuilder() {
      if (eventBuilder_ == null) {
        eventBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.Event,
                com.google.cloud.visionai.v1.Event.Builder,
                com.google.cloud.visionai.v1.EventOrBuilder>(
                getEvent(), getParentForChildren(), isClean());
        event_ = null;
      }
      return eventBuilder_;
    }
<pre>
Required. The resource being updated.
</pre>

<code>.google.cloud.visionai.v1.Event event = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UpdateEventRequest.java