private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
          getPositionFieldBuilder();
        }
      }
<pre>
A face-specific landmark (for example, a face feature).
</pre>

Protobuf type {@code google.cloud.vision.v1.FaceAnnotation.Landmark}
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/FaceAnnotation.java