Add 'wait_for_active_shards' to Indices\Open whitelist

Author: polyfractal

src/Elasticsearch/Endpoints/Indices/Open.php

@@ -50,6 +50,7 @@ public function getParamWhitelist()
             'ignore_unavailable',
             'allow_no_indices',
             'expand_wildcards',
+            'wait_for_active_shards',
         );
     }