As a RH associate, I want to observe OpenShift Logging Log Store metrics across the Elasticsearch fleet, so that I can inform my BU, eng team, etc. about how features are used or which problem areas exists or how big the clusters are.

Acceptance criteria

1. Feature usage in the Elasticsearch Customer Resource: Expose metrics from EO on which feature are used (e.g. persistent vs. ephemeral storage, multi-node clusters with more than 3 data nodes, Types of Redundancy used)
2. Problem areas: index management policies, retention per policy (app, infra, audit), request/limits not equal
3. Sizing metrics from ES metrics: Telemetry on active indices/shards

Dev Notes

• Outcome is a google doc describing 5-10 metrics in total for the three acceptance criteria.
• We don't need to be conclusive nor complete
• Similar implementation for Loki just for CR metrics: https://github.com/ViaQ/loki-operator/pull/32 (Take this as inspiration only)