provider/aws: Log ElasticCache subnet removal

builtin/providers/aws/resource_aws_elasticache_subnet_group.go

@@ -89,6 +89,7 @@ func resourceAwsElasticacheSubnetGroupRead(d *schema.ResourceData, meta interfac
 	if err != nil {
 		if ec2err, ok := err.(awserr.Error); ok && ec2err.Code() == "CacheSubnetGroupNotFoundFault" {
 			// Update state to indicate the db subnet no longer exists.
+			log.Printf("[WARN] Elasticache Subnet Group (%s) not found, removing from state", d.Id())
 			d.SetId("")
 			return nil
 		}