I'm benchmarking Elasticsearch and observes high buffer_pools for mapped, it keeps on growing when performing heavy indexing and search operations at the same time.


That's around 114GB on buffer_pools. Elasticsearch is running on machine with 32GB RAM (16GB for ES heap), memory lock enabled.

Please advice on what might be the cause of this high memory usage on buffer_pools. And why it exceeds RAM by significant amount? does it mean swapping is somehow happening?

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