Problem: large single index with mmap

Elastic Stack Elasticsearch
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I am getting higher execution time around 10 sec when running query with mmapfs index having 2 TB size.

But the same query with another index 2 TB store type niofs executes it within 1 second.

Is single large single index of store type mmap is a problem?

FYI, I am having 64-bit unix machine with high vm.max_map_count and 10 nodes 200 GB RAM allocated to ES across nodes.

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