Identify hot shards

Definition of a hot shard- The shard that consumes high resource consumption on a node i.e JVM/CPU. The /_index/stats API doesn't clearly account for JVM(field-data/node/shard cache) vs off-heap consumption(segment/doc values).
Is there a way we could know on a index/shard level how much heap a shard is consuming.
Should current ops eg indexing.index_current/search.fetch_current be indicative of CPU consumption

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