jpountz commented on issue #1179: LUCENE-9147: Move the stored fields index off-heap. URL: https://github.com/apache/lucene-solr/pull/1179#issuecomment-575722955 We have this information for a few datasets at https://elasticsearch-benchmarks.elastic.co/index.html#tracks/geonames/nightly/default/30d. For instance 3.8MB for the geonames dataset or 6MB for the HTTP logs dataset. It's not much, but these datasets are not very large either (3.1GB and 18.6GB respectively). As you can see it's the main contributor to memory usage after the terms index (which we still load it on-heap for the `_id` field for now) so if a user loads the terms index off-heap, it may well be that stored fields are the main heap user.
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