Use the latest 1.x, 2.x, 5.x ES, build with Go 1.6 and 1.7

.travis.yml

@@ -1,27 +1,31 @@
 language: go
 
+addons:
+  apt:
+    packages:
+      - oracle-java8-set-default
+
 go:
-  - 1.5.4
-  - 1.6.3
-  - 1.7.1
+  - 1.6.4
+  - 1.7.5
 
 env:
   global:
-    - GO15VENDOREXPERIMENT=1
+    - JAVA_HOME=/usr/lib/jvm/java-8-oracle
   matrix:
-    - ES_VERSION=1.3.4
-    - ES_VERSION=1.4.4
-    - ES_VERSION=1.5.2
-    - ES_VERSION=1.6.0
-    - ES_VERSION=1.7.0
+    - ES_VERSION=1.7.5 ES_URL=https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch-1.7.5.tar.gz
+    - ES_VERSION=2.4.4 ES_URL=https://download.elastic.co/elasticsearch/release/org/elasticsearch/distribution/tar/elasticsearch/2.4.4/elasticsearch-2.4.4.tar.gz
+    - ES_VERSION=5.2.0 ES_URL=https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.2.0.tar.gz
 
 before_script:
+  - java -version
+  - echo $JAVA_HOME
   - mkdir ${HOME}/elasticsearch
-  - wget https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch-${ES_VERSION}.tar.gz
+  - wget $ES_URL
   - tar -xzf elasticsearch-${ES_VERSION}.tar.gz -C ${HOME}/elasticsearch
-  - "echo 'script.groovy.sandbox.enabled: true' >> ${HOME}/elasticsearch/elasticsearch-${ES_VERSION}/config/elasticsearch.yml"
-  - ${HOME}/elasticsearch/elasticsearch-${ES_VERSION}/bin/elasticsearch >/dev/null &
-  - sleep 10 # Wait for ES to start up
+  - "echo 'script.inline: true' >> ${HOME}/elasticsearch/elasticsearch-${ES_VERSION}/config/elasticsearch.yml"
+  - ${HOME}/elasticsearch/elasticsearch-${ES_VERSION}/bin/elasticsearch &
+  - wget --retry-connrefused http://127.0.0.1:9200/ # Wait for ES to start up
 
 install:
   - go get github.com/Masterminds/glide