public Builder clearActiveZone() {
      if (activeZoneBuilder_ == null) {
        if (annotationPayloadCase_ == 5) {
          annotationPayloadCase_ = 0;
          annotationPayload_ = null;
          onChanged();
        }
      } else {
        if (annotationPayloadCase_ == 5) {
          annotationPayloadCase_ = 0;
          annotationPayload_ = null;
        }
        activeZoneBuilder_.clear();
      }
      return this;
    }
<pre>
Annotation for type ACTIVE_ZONE
</pre>

<code>.google.cloud.visionai.v1.NormalizedPolygon active_zone = 5;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/StreamAnnotation.java