def get_grade_system_search_session(self):
raise Unimplemented()<EOL>
Gets the ``OsidSession`` associated with the grade system search service.

        return: (osid.grading.GradeSystemSearchSession) - a
                ``GradeSystemSearchSession``
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented - ``supports_grade_system_search()`` is
                ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_grade_system_search()`` is ``true``.*