What problem are you trying to solve?

Focus on the what and why of the need you have, not the how you'd like it solved.

seeing which indices are actually used. so not used ones can be easily deleted without side effects that another node might actually use it

What would you like to see happen?

Describe the desired outcome or enhancement.

aggregate the index usage of all nodes in the cluster and show that in the index usage

Why is this important to you or your team?

Explain how the request adds value or solves a business need.

reduces a lot of friction and accidental removal of an index that then hurts performance because its actually used, but wasn't shown as such.

What steps, if any, are you taking today to manage this problem?

going through each node itself, query the stats there and then aggregate them.