code: def delete_hierarchy(self, hierarchy_id):
          
          collection = JSONClientValidated('hierarchy',
                                           collection='Hierarchy',
                                           runtime=self._runtime)
          if not isinstance(hierarchy_id, ABCId):
              return InvalidArgument('the argument is not a valid OSID Id')
  
          # Should we delete the underlying Relationship Family here???
  
          collection.delete_one({'_id': ObjectId(hierarchy_id.get_identifier())})
docs: Deletes a ``Hierarchy``.
  
          arg:    hierarchy_id (osid.id.Id): the ``Id`` of the
                  ``Hierarchy`` to remove
          raise:  NotFound - ``hierarchy_id`` not found
          raise:  NullArgument - ``hierarchy_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*