def get_vault_search_session(self):
raise Unimplemented()<EOL>
Gets the OsidSession associated with the vault search service.

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