Tweak script for new cli format

Author: polyfractal

travis/download_and_run_es.sh

@@ -25,8 +25,8 @@ find . -name "elasticsearch.yml" | while read TXT ; do echo 'path.repo: ["/tmp"]
 echo "Starting Elasticsearch v${ES_VERSION}"
 
 ./elasticsearch-*/bin/elasticsearch \
-    -E es.discovery.zen.ping_timeout=1s \
-    -E es.discovery.zen.minimum_master_nodes=1 \
+    -E discovery.zen.ping_timeout=1s \
+    -E discovery.zen.minimum_master_nodes=1 \
     -d