We are using ELK but NOT X-Pack and recently upgraded to 6.3. We have noticed the following indices appearing:
What are these?
Can we delete them?
How best to manage them (periodic deletion mechanism)?
Those are system indices created by Elasticsearch and Kibana, they're usually small and gets deleted after seven days so i wouldn't worry.
In addition to what Bernt said: With 6.3 x-pack ships with any distribution by default and monitoring is enabled by default. If you really want to disable it, you can, see https://www.elastic.co/guide/en/elasticsearch/reference/current/monitoring-settings.html
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