KPI Metrics for Elastic

Elastic Stack Elasticsearch
1

If you had to define some high level metrics based KPI's for elastic what would they be ?

I guess there are index latency, search latency but what others if any do you think are important for a search service?

Thanks

D/

2

This may have some ideas for you https://www.elastic.co/guide/en/elasticsearch/guide/master/cluster-admin.html