Use Elasticsearch 5.6.15

.ci/docker-compose.yml

@@ -21,7 +21,7 @@ services:
       - elasticsearch-oss
 
   elasticsearch-oss:
-    image: docker.elastic.co/elasticsearch/elasticsearch:${ELASTICSEARCH_VERSION:-7.0.0-beta1}
+    image: docker.elastic.co/elasticsearch/elasticsearch:${ELASTICSEARCH_VERSION:-5.6.15}
       - elasticsearch
     volumes:
       - esvol:/tmp
@@ -56,7 +56,7 @@ services:
       - elasticsearch-platinum
 
   elasticsearch-platinum:
-    image: docker.elastic.co/elasticsearch/elasticsearch:${ELASTICSEARCH_VERSION:-7.0.0-beta1}
+    image: docker.elastic.co/elasticsearch/elasticsearch:${ELASTICSEARCH_VERSION:5.6.15}
     ports:
       - "9200:9200"
     networks:

.ci/test-matrix.yml

@@ -1,6 +1,6 @@
 ---
 ELASTICSEARCH_VERSION:
-- 7.0.0-beta1
+- 5.6.15
 
 NODE_JS_VERSION:
 - 10

.travis.yml

@@ -11,7 +11,7 @@ node_js:
 
 env:
   global:
-    - ELASTICSEARCH_VERSION=7.0.0-beta1
+    - ELASTICSEARCH_VERSION=5.6.15
     - QUIET=true
 
 before_install:

scripts/es-docker-platinum.sh

@@ -28,5 +28,4 @@ exec docker run \
   -v "$repo$testnodekey:/usr/share/elasticsearch/config/certs/testnode.key" \
   -v "$repo$cacrt:/usr/share/elasticsearch/config/certs/ca.crt" \
   -p 9200:9200 \
-  docker.elastic.co/elasticsearch/elasticsearch:7.0.0-beta1
-  # docker.elastic.co/elasticsearch/elasticsearch:6.6.0
+  docker.elastic.co/elasticsearch/elasticsearch:5.6.15

scripts/es-docker.sh

@@ -9,5 +9,4 @@ exec docker run \
   -p 9200:9200 \
   --network=elastic \
   --name=elasticsearch \
-  docker.elastic.co/elasticsearch/elasticsearch:7.0.0-beta1
-  # docker.elastic.co/elasticsearch/elasticsearch:6.6.0
+  docker.elastic.co/elasticsearch/elasticsearch:5.6.15