code: def find_elb_dns_zone_id(name='', env='dev', region='us-east-1'):
      
      LOG.info('Find %s ELB DNS Zone ID in %s [%s].', name, env, region)
      client = boto3.Session(profile_name=env).client('elb', region_name=region)
      elbs = client.describe_load_balancers(LoadBalancerNames=[name])
      return elbs['LoadBalancerDescriptions'][0]['CanonicalHostedZoneNameID']
docs: Get an application's AWS elb dns zone id.
  
      Args:
          name (str): ELB name
          env (str): Environment/account of ELB
          region (str): AWS Region
  
      Returns:
          str: elb DNS zone ID