WARNING: This documentation covers Elasticsearch 2.x. The 2.x versions of Elasticsearch have passed their EOL dates. If you are running a 2.x version, we strongly advise you to upgrade.
This documentation is no longer maintained and may be removed. For the latest information, see the current Elasticsearch documentation.
Elasticsearch Versionedit
The initial print version of this book targeted Elasticsearch version 1.4.0. We are actively updating the explanations and code examples in the online version to target Elasticsearch 2.x.
You can track the updates by visiting the GitHub repository.