IMPORTANT: elasticsearch.js has been replaced by the new Elasticsearch JavaScript client. We strongly advise you to migrate to the new client. To learn more, see the migration guide.
Extendingedit
We decided to make this client low-level, and as such we probably have not implemented all the features you are looking for. For this reason, we made extending or even replacing the core components simple.
Check out the Extensions page for a list of known extensions.