Do not upgrade production clusters to Elasticsearch 8.0.0-rc2. Elasticsearch 8.0.0-rc2 is a pre-release of Elasticsearch 8.0 and is intended for testing purposes only.

Upgrades from pre-release builds are not supported and could result in errors or data loss. If you upgrade from a released version, such as 7.16, to a pre-release version for testing, discard the contents of the cluster when you are done. Do not attempt to upgrade to the final 8.0 release.

If you installed Elasticsearch from an archive on an aarch64 platform like Linux ARM or macOS M1, the elastic user password and Kibana enrollment token are not generated automatically when starting your node for the first time.

After the node starts, generate the elastic password with the bin/elasticsearch-reset-password tool:

bin/elasticsearch-reset-password -u elastic

Then, create an enrollment token for Kibana with the bin/elasticsearch-create-enrollment-token tool:

bin/elasticsearch-create-enrollment-token -s kibana

Deprecationsedit

Deprecate setting max_merge_at_once_explicit #80574