'Get a single Health Check from a zone
:param zone: Zone in which the health check is
:type zone: :class:`Zone`
:param health_check_id: ID of the required health check
:type  health_check_id: ``str``
:return: :class:`AuroraDNSHealthCheck`'

def ex_get_healthcheck(self, zone, health_check_id):

    self.connection.set_context({'resource': 'healthcheck', 'id': health_check_id})
    res = self.connection.request(('/zones/%s/health_checks/%s' % (zone.id, health_check_id)))
    check = res.parse_body()
    return self.__res_to_healthcheck(zone, check)
