[es] Include docker stack deploy instructions

Author: itzg

elasticsearch/README.md

@@ -54,6 +54,24 @@ and then check the cluster health, such as http://192.168.99.100:9200/_cluster/h
       "unassigned_shards" : 0
     }
 
+If you have a Docker Swarm cluster already initialized you can download this
+[docker-compose.yml](https://raw.githubusercontent.com/itzg/dockerfiles/master/elasticsearch/docker-compose.yml)
+and deploy a cluster using:
+
+    docker stack deploy -c docker-compose.yml es
+
+With a `docker service ls` you can confirm 1 master, 2 data, and 1 gateway nodes are running:
+
+```
+ID            NAME        MODE        REPLICAS  IMAGE
+9nwnno8hbqgk  es_kibana   replicated  1/1       kibana:latest
+f5x7nipwmvkr  es_gateway  replicated  1/1       es
+om8rly2yxylw  es_data     replicated  2/2       es
+tdvfilj370yn  es_master   replicated  1/1       es
+```
+
+As you can see, there is also a Kibana instance included and available at port 5601.
+
 # Configuration Summary
 
 ## Ports

elasticsearch/docker-compose.yml

@@ -2,26 +2,27 @@ version: '3'
 
 services:
   master:
-    image: es
+    image: itzg/elasticsearch
     environment:
       TYPE: MASTER
       UNICAST_HOSTS: master
-      MIN_MASTERS: 2
+      MIN_MASTERS: 1
     deploy:
-      replicas: 3
+      replicas: 1
       update_config:
         parallelism: 1
   data:
-    image: es
+    image: itzg/elasticsearch
     environment:
       TYPE: DATA
       UNICAST_HOSTS: master
     deploy:
       replicas: 2
       update_config:
         parallelism: 1
+        delay: 60s
   gateway:
-    image: es
+    image: itzg/elasticsearch
     ports:
       - "9200:9200"
       - "9300:9300"