title: terraform output multiple aws ebs_volumes
body: <pre><code>$ terraform --version
  Terraform v0.11.7
  + provider.aws v1.28.0
  </code></pre>
  
  <p>I would like to find out if it's possible to output all the ebs volumes from an AWS instance. </p>
  
  <p>I have a main.tf with the below: </p>
  
  <pre><code>data "aws_instance" "kafka_nodes" {
    filter {
      name = "tag:Name"
      values = ["mykas00*"]
    }
  }
  
  output "block_devs" {
    value = "${data.aws_instance.kafka_nodes.ebs_block_device}"
  }
  </code></pre>
  
  <p>The above only prints one volume but I have verified with <code>AWS CLI</code> that the instance in question has multiple volumes</p>