Use OSS version of ELK images

Issue-ID: CLAMP-222
Change-Id: I7ee3b0376440a590d4b945ebb2b2dc3d0183d6a1
Signed-off-by: ac2550 <ac2550@intl.att.com>
diff --git a/extra/docker/elk/docker-compose.yml b/extra/docker/elk/docker-compose.yml
index 3b5571e..bba6791 100644
--- a/extra/docker/elk/docker-compose.yml
+++ b/extra/docker/elk/docker-compose.yml
@@ -2,7 +2,7 @@
 
 services:
   elasticsearch:
-    image: docker.elastic.co/elasticsearch/elasticsearch:6.1.3
+    image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.1.3
     ports:
       - 9200:9200
     networks:
@@ -15,7 +15,7 @@
       - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
 
   logstash:
-    image: docker.elastic.co/logstash/logstash:6.1.3
+    image: docker.elastic.co/logstash/logstash-oss:6.1.3
     volumes:
       - ./logstash-conf:/config-dir
       - ./logstash-input:/log-input
@@ -36,7 +36,7 @@
       - elasticsearch_hosts=elasticsearch
 
   kibana:
-    image: docker.elastic.co/kibana/kibana:6.1.3
+    image: docker.elastic.co/kibana/kibana-oss:6.1.3
     ports:
       - 5601:5601
     depends_on: