The documentation you are looking at is in the process of being revised.
Elasticsearch Add-On for Heroku now supports additional features that let you do more with our hosted offering:
- Support for the index lifecycle management (ILM) feature of the Elastic Stack. If you are using the Elastic Stack 6.7 or later, ILM provides an integrated and streamlined way to manage time-based data, making it easier to follow best practices for managing your indices. For example: You can automate how Elasticsearch Add-On for Heroku manages indices and apply operations, such as index relocation, force merging, and index shrinking.
- Migration to hot-warm architecture. Elasticsearch Add-On for Heroku now supports migrating some existing deployments to a hot-warm architecture. If you have a deployment that is getting overwhelmed by the volume of incoming data or that contains logging data that doesn’t all need to be on fast storage, you might be able to migrate your deployment to a hot-warm architecture by adding another data configuration.
Service release: April 19, 2019 (Milestone 20)