VOL-612 - rename images to work better with public repository

Change-Id: I9679544987c3a08d0001928cfbc39d710a6c1eae
diff --git a/compose/docker-compose-elasticsearch.yml b/compose/docker-compose-elasticsearch.yml
index 97f6176..72a3739 100644
--- a/compose/docker-compose-elasticsearch.yml
+++ b/compose/docker-compose-elasticsearch.yml
@@ -2,7 +2,7 @@
 
 services:
   elasticsearch:
-    image: "${REGISTRY}docker.elastic.co/elasticsearch/elasticsearch:${ELASTIC_TAG:-5.6.0}"
+    image: "docker.elastic.co/elasticsearch/elasticsearch:${ELASTIC_TAG:-5.6.0}"
     environment:
       - transport.host=localhost
       - transport.tcp.port=9300