An array of faces detected and added to the collection. For more
information, see Searching Faces in a Collection in the Amazon Rekognition
Developer Guide.
If your collection is associated with a face detection model that's later
than version 3.0, the value of OrientationCorrection is always
null and no orientation information is returned.
An array of faces that were detected in the image but weren't indexed. They
weren't indexed because the quality filter identified them as low quality,
or the MaxFaces request parameter filtered them out. To use the
quality filter, you specify the QualityFilter request
parameter.