lib/databases/elasticsearch.js: deep clone options object before clie…

…nt creation

see elastic#33 (comment)

Signed-off-by: Chris Dituri <csdituri@gmail.com>

lib/databases/elasticsearch.js

@@ -26,7 +26,7 @@ var ElasticSearchSessionStore = function (options) {
     options.host = 'localhost:9200';
   }
 
-  this.options = options;
+  this.options = _.clone(options);
 
   this.index = this.options.index;
   this.typeName = this.options.typeName;