public virtual void DeleteFaceFromFaceList(string faceListId, Guid persistedFaceId)
 {
     PolicyService.ExecuteRetryAndCapture400Errors(
         "FaceService.DeleteFaceFromFaceList",
         ApiKeys.FaceRetryInSeconds,
         () =>
     {
         FaceRepository.DeleteFaceFromFaceList(faceListId, persistedFaceId);
         return(true);
     },
         false);
 }