disable network on sidekicks, use minimal volume image for storage

templates/es-cluster/0/docker-compose.yml.tpl

@@ -104,8 +104,12 @@ services:
     es-storage:
         labels:
             io.rancher.container.start_once: true
-        image: docker.elastic.co/elasticsearch/elasticsearch:5.4.0
-        entrypoint: /bin/true
+		network_mode: none
+        image: rawmind/alpine-volume:0.0.2-1
+        environment:
+			- SERVICE_UID=1000
+			- SERVICE_GID=1000
+			- SERVICE_VOLUME=/usr/share/elasticsearch/data
         volumes: 
             - es-storage-volume:/usr/share/elasticsearch/data
 
@@ -113,6 +117,7 @@ services:
     es-sysctl:
         labels:
             io.rancher.container.start_once: true
+		network_mode: none	
         image: rawmind/alpine-sysctl:0.1
         privileged: true
         environment: