def get_id_lookup_session(self):
Gets the session associated with the id lookup service.

        return: (osid.id.IdLookupSession) - an ``IdLookupSession``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_id_lookup()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_id_lookup()`` is ``true``.*