Specify explicitly one data.path

Change-Id: Idb1cb203b4c81ebe592e4d532d7d6b0ff1ca8e35
Fixes-bug: #1559126

deployment_scripts/puppet/manifests/elasticsearch.pp

@@ -44,7 +44,7 @@ file { $es_dir:
 
 # Install elasticsearch
 class { 'elasticsearch':
-  datadir       => ["${es_dir}/elasticsearch_data"],
+  datadir       => "${es_dir}/elasticsearch_data",
   init_defaults => {
       'MAX_LOCKED_MEMORY' => 'unlimited',
       'ES_HEAP_SIZE'      => "${es_heap_size}g"
@@ -73,4 +73,4 @@ elasticsearch::instance { $es_instance:
     'transport.bind_host'                => $mgmt_address,
     'transport.publish_host'             => $mgmt_address,
   }
-}
+}