Camunda is not compatible with the Elasticsearch 8 Curator. This Curator is used to manage data retention within Elasticsearch. To update to Elasticsearch 8, the Curator must be replaced with Index Lifecycle Management (ILM). Once the update to Elasticsearch 8 is complete, the Curator can be disabled. Disabling the Curator before could result in indexes without a configured ILM policy. These will not get deleted automatically.
Details on how to configure ILM for Zeebe can be found on the Elasticsearch exporter page.
The Elasticsearch Curator can be replaced with ILM when using Elasticsearch 7 as well. This is useful when incrementally updating from Elasticsearch 7 to 8.