See the docmentation page in the webdev bootcamp guide for documentation conventions.
The documentation is available in HTML and PDF forms at http://elasticutils.readthedocs.org/. This tracks documentation in the master branch of the git repository. Because of this, it is always up to date.
Also, of extreme high-priority hyperbole-ignoring importance:
Refers to the pyelasticsearch ElasticSearch class and instances.
Elasticsearch (no camel-case)
The Elasticsearch software.