The documentation you are looking at is in the process of being revised.
This section summarizes the changes in each Elasticsearch Add-On for Heroku release:
- Elasticsearch and Kibana 6.8.3 available - September 05, 2019
- Cross-cluster search
- Console usability improvements and Kibana bug fix released - July 3, 2019
- Snapshot repository support for GCS and private subscription tier available - June 5, 2019
- Support for Elastic Stack 6.8, and 7.1, released - May 20, 2019
- Support for index lifecycle management (ILM) and migration to hot-warm architecture available - April 19, 2019
- Support for the Elasticsearch keystore, faster deployment creation, support for Elastic Stack 7.0, and more features released - March 20, 2019
- Increased trial capacity, increased scaling limit, and more features released - February 13, 2019
- Support for APM Servers, automatic multi-factor authentication, and more features released - January 24, 2019
- Support to fine-tune snapshot retention periods, open support cases from the Elasticsearch Add-On for Heroku console, and more features released - December 17, 2018
- Cloud Console improvements, support to configure snapshot intervals, and more features released - November 12, 2018
- SAML Support for Elasticsearch and Kibana released - October 29, 2018
- Next-Generation of Elasticsearch Add-On for Heroku released - August 1, 2018
- Elasticsearch Service branding update - July 3, 2018
- Minor Cloud Console updates released - June 19, 2018
- New Cloud Console released - May 16, 2018
Also see Restrictions and known problems.