Add a possibility to deploy Elasticsearch 5.x version

Elasticsearch 2.x version is deployed by default

Change-Id: I78e714807cf5925a9619961ab145f27ef0210652
diff --git a/tests/pillar/curator.sls b/tests/pillar/curator.sls
index f4b8158..7425a81 100644
--- a/tests/pillar/curator.sls
+++ b/tests/pillar/curator.sls
@@ -4,6 +4,7 @@
     bind:
       address: 0.0.0.0
       port: 9200
+    version: 2
     curator:
       timeout: 900
       logfile: /var/log/elasticsearch/curator.log