provider/aws: Add support for ECS svc - LB target group

builtin/providers/aws/resource_aws_ecs_service.go

@@ -76,7 +76,13 @@ func resourceAwsEcsService() *schema.Resource {
 					Schema: map[string]*schema.Schema{
 						"elb_name": &schema.Schema{
 							Type:     schema.TypeString,
-							Required: true,
+							Optional: true,
+							ForceNew: true,
+						},
+
+						"target_group_arn": &schema.Schema{
+							Type:     schema.TypeString,
+							Optional: true,
 							ForceNew: true,
 						},
 

builtin/providers/aws/structure.go

@@ -125,9 +125,15 @@ func expandEcsLoadBalancers(configured []interface{}) []*ecs.LoadBalancer {
 		data := lRaw.(map[string]interface{})
 
 		l := &ecs.LoadBalancer{
-			ContainerName:    aws.String(data["container_name"].(string)),
-			ContainerPort:    aws.Int64(int64(data["container_port"].(int))),
-			LoadBalancerName: aws.String(data["elb_name"].(string)),
+			ContainerName: aws.String(data["container_name"].(string)),
+			ContainerPort: aws.Int64(int64(data["container_port"].(int))),
+		}
+
+		if v, ok := data["elb_name"]; ok {
+			l.LoadBalancerName = aws.String(v.(string))
+		}
+		if v, ok := data["target_group_arn"]; ok {
+			l.TargetGroupArn = aws.String(v.(string))
 		}
 
 		loadBalancers = append(loadBalancers, l)
@@ -553,10 +559,18 @@ func flattenEcsLoadBalancers(list []*ecs.LoadBalancer) []map[string]interface{}
 	result := make([]map[string]interface{}, 0, len(list))
 	for _, loadBalancer := range list {
 		l := map[string]interface{}{
-			"elb_name":       *loadBalancer.LoadBalancerName,
 			"container_name": *loadBalancer.ContainerName,
 			"container_port": *loadBalancer.ContainerPort,
 		}
+
+		if loadBalancer.LoadBalancerName != nil {
+			l["elb_name"] = *loadBalancer.LoadBalancerName
+		}
+
+		if loadBalancer.TargetGroupArn != nil {
+			l["target_group_arn"] = *loadBalancer.TargetGroupArn
+		}
+
 		result = append(result, l)
 	}
 	return result