wrong elastic version

docker-compose.yml

@@ -14,12 +14,12 @@ services:
       - net
 
   elasticsearch:
-    image: 'docker.elastic.co/elasticsearch/elasticsearch:6.7'
+    image: elasticsearch:6.7.0
     restart: always
     container_name: elasticsearch
     hostname: elasticsearch
     environment:
-      - cluster.name=elasticsearch
+      - discovery.type=single-node
     ulimits:
       memlock:
         soft: -1