Rekognition Analyse Face service : FaceOccluded missing

Hello,

I ran Rekognition, detectFaces(DetectFacesRequest facesRequest) from java SDK with option Attribute.ALL, but I did not found in the DetectFacesResult the attribute: FaceOccluded. This attribute appears on the demo web page of the Rekognition service.

Do I have to make a special call, or invoke a particular version of Analyse Face (Rekognition.detectFaces) ?

Thank you, Mihai ADAM