code: def elbv2_load_balancer_hosted_zone(self, lookup, default=None):
      
      try:
        elb = self._elbv2_load_balancer(lookup)
        return elb['CanonicalHostedZoneId']
      except ClientError:
        return default
docs: Args:
        lookup: the friendly name of the V2 elb to look up
        default: value to return in case of no match
      Returns:
        The hosted zone ID of the ELB found with a name matching 'lookup'.