some minor fixes

dockerfiles/elk/docker-compose.yml

@@ -1,7 +1,7 @@
 version: '2'
 services:
     elasticsearch:
-        image: docker.elastic.co/elasticsearch/elasticsearch:6.4.2
+        image: docker.elastic.co/elasticsearch/elasticsearch:6.5.1
         container_name: elasticsearch
         hostname: elasticsearch
         ports:
@@ -22,7 +22,7 @@ services:
 
     kibana:
         image:
-            docker.elastic.co/kibana/kibana:6.4.2
+            docker.elastic.co/kibana/kibana:6.5.1
         hostname: kibana
         ports:
         - "5601:5601"