Pancake has been developed with ElasticSearch version 0.19.0, which you can download at '''[http://www.elasticsearch.org/download/2012/03/01/0.19.0.htmlhere]'''. More recent versions probably work, but are not guaranteed to.
After you install ElasticSearch, please add the schema found at * https://bitbucket.org/mozillapancake/pancake/src/2b037de0971c/fxhome-lattice/etc/elasticsearch/config
These files will tell ElasticSearch how to index data, and how it should be retrieved. The default configuration for pancake Pancake expects port 9200 for ElasticSearch.