Query: ecs_container_instances_for_ecs_service

select
  i.arn as container_instance_arn
from
  aws_ecs_service as s
  left join aws_ecs_container_instance as i on s.cluster_arn = i.cluster_arn
  left join aws_ec2_instance as e on i.ec2_instance_id = e.instance_id
where
  i.arn is not null
  and s.arn = $1;