Set discovery.type option in Compose file for easier override

ref. #410

docker-compose.yml

@@ -20,6 +20,9 @@ services:
     environment:
       ES_JAVA_OPTS: "-Xmx256m -Xms256m"
       ELASTIC_PASSWORD: changeme
+      # Use single node discovery in order to disable production mode and avoid bootstrap checks
+      # see https://www.elastic.co/guide/en/elasticsearch/reference/current/bootstrap-checks.html
+      discovery.type: single-node
     networks:
       - elk
 

docker-stack.yml

@@ -13,6 +13,9 @@ services:
     environment:
       ES_JAVA_OPTS: "-Xmx256m -Xms256m"
       ELASTIC_PASSWORD: changeme
+      # Use single node discovery in order to disable production mode and avoid bootstrap checks
+      # see https://www.elastic.co/guide/en/elasticsearch/reference/current/bootstrap-checks.html
+      discovery.type: single-node
     networks:
       - elk
     deploy:

elasticsearch/config/elasticsearch.yml

@@ -5,11 +5,6 @@
 cluster.name: "docker-cluster"
 network.host: 0.0.0.0
 
-## Use single node discovery in order to disable production mode and avoid bootstrap checks
-## see https://www.elastic.co/guide/en/elasticsearch/reference/current/bootstrap-checks.html
-#
-discovery.type: single-node
-
 ## X-Pack settings
 ## see https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-xpack.html
 #