fix #1418 elasticsearch up fails.

docker-compose.yml

@@ -507,7 +507,6 @@ services:
       build: ./elasticsearch
       volumes:
         - elasticsearch-data:/usr/share/elasticsearch/data
-        - elasticsearch-plugins:/usr/share/elasticsearch/plugins
       environment:
         - cluster.name=laradock-cluster
         - bootstrap.memory_lock=true
@@ -747,5 +746,3 @@ volumes:
     driver: "local"
   elasticsearch-data:
     driver: "local"
-  elasticsearch-plugins:
-    driver: "local"

elasticsearch/Dockerfile

@@ -1,3 +1,3 @@
-FROM docker.elastic.co/elasticsearch/elasticsearch:5.4.1
+FROM docker.elastic.co/elasticsearch/elasticsearch:6.2.3
 
 EXPOSE 9200 9300