Update docker.elastic.co/elasticsearch/elasticsearch Docker tag to v6.8.4 (#3777)

renovate[bot] · Tom Linton · commit 2bf7e4546cd1 · 2019-10-24T12:40:20.000+13:00
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -15,7 +15,7 @@ services:
 
   elasticsearch:
     container_name: elasticsearch
-    image: docker.elastic.co/elasticsearch/elasticsearch:6.8.3
+    image: docker.elastic.co/elasticsearch/elasticsearch:6.8.4
     ports:
       - "9200:9200"
     environment:
