Before turning off the logstash v5 hosts we will need to find a new home for the api-feature-usage elasticsearch outputs that are currently serviced by the v5 clusters.
- Add profile::apifeatureusage::logstash::input_kafka_ssl_truststore_passwords secrets to puppet private
- Merge and deploy https://gerrit.wikimedia.org/r/c/operations/puppet/+/747634/2
- Disable puppet on elk5 hosts
- Stop logstashes on elk5 hosts
- Merge and deploy https://gerrit.wikimedia.org/r/c/operations/puppet/+/752211/7
- Check that events are flowing
- move elk5 hosts to role::spare::system and prep for decom