I want to know details about how we reduced the heap usage per shard

Through this blog I see that starting from 8.3, we have significantly reduced Usage of each shard of the heap. I would like to know more details about how we can reduce the heap usage per shard. Anyone knows a PR or blog about this optimization, i can't find it in release note of 8.3

It was a combination of lots of small fixes, several of which landed in versions before 8.3 too. See Fix Large Shard Count Scalability Issues · Issue #77466 · elastic/elasticsearch · GitHub.

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