The elasticsearch Rubygem provides a low-level client for communicating with an Elasticsearch cluster, fully compatible with other official clients.

More documentation is hosted in Github and RubyDoc.


  • Pluggable logging and tracing
  • Pluggable connection selection strategies (round-robin, random, custom)
  • Pluggable transport implementation, customizable and extendable
  • Pluggable serializer implementation
  • Request retries and dead connections handling
  • Node reloading (based on cluster state) on errors or on demand
  • Modular API implementation
  • 100% REST API coverage

Transport and APIedit

The elasticsearch gem combines three separate Rubygems:

  • elasticsearch-transport provides an HTTP Ruby client for connecting to the Elasticsearch cluster,
  • elasticsearch-api provides a Ruby API for the Elasticsearch RESTful API.
  • elasticsearch-xpack provides a Ruby API for the Elasticsearch RESTful API for X-Pack endpoints. Notice that the API endpoints living in elasticsearch-xpack will be moved into elasticsearch-api in version 8.0.0 and forward. You should be able to keep using elasticsearch-xpack and the xpack namespace in 7.x versions. We’re running the same tests in elasticsearch-xpack, but if you encounter any problems, please let us know in this issue.

Please consult their respective documentation for configuration options and technical details.

Notably, the documentation and comprehensive examples for all the API methods are contained in the source, and available online at Rubydoc.

Keep in mind, that for optimal performance, you should use an HTTP library which supports persistent ("keep-alive") HTTP connections.