add docker-compose file to set up ES5 for testing

tests/ES5/config/elasticsearch.yml

@@ -0,0 +1,3 @@
+xpack.security.enabled: false
+cluster.name: "docker-cluster"
+network.host: 0.0.0.0

tests/ES5/docker-compose.yml

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+version: "2"
+services:
+  elasticsearch1:
+    build: .
+    container_name: elasticsearch1
+    environment:
+      - cluster.name=docker-cluster
+      - bootstrap.memory_lock=true
+      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
+    ulimits:
+      memlock:
+        soft: -1
+        hard: -1
+    mem_limit: 1g
+    ports:
+      - 9200:9200
+    networks:
+      - esnet
+  elasticsearch2:
+    build: .
+    environment:
+      - cluster.name=docker-cluster
+      - bootstrap.memory_lock=true
+      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
+      - "discovery.zen.ping.unicast.hosts=elasticsearch1"
+    ulimits:
+      memlock:
+        soft: -1
+        hard: -1
+    mem_limit: 1g
+    networks:
+      - esnet
+
+networks:
+  esnet: {}

tests/ES5/dockerfile

@@ -0,0 +1,3 @@
+FROM docker.elastic.co/elasticsearch/elasticsearch:5.6.0
+
+COPY config /usr/share/elasticsearch/config/