[7.17] Change elasticsearch.username: elastic
deprecation level to critical
#122717
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Resolves #122704.
This changes the warning in the upgrade assistant:
Testing
Kibana normally forbids you from using this config when running from source.
First, temporarily remove that validation:
Then, add this config to your kibana.yml:
Start Elasticsearch and Kibana, log into Kibana, and navigate to the upgrade assistant. You should see the critical deprecation there.
The upgrade assistant is at this route: http://localhost:5601/app/management/stack/upgrade_assistant/kibana_deprecations
8.1 companion PR: #122722 (will be backported to 8.0)