I still don't understand this and hoping someone can help me understand it. I read that Lucene uses off-heap RAM and so having lots available as file cache for Lucene will greatly improve full text search.
I have a 96GB RAM machine. I've allocated 32GB to elasticsearch. The rest should theoretically be used by Lucene. However, my overall RAM usage never goes much above 32GB. I don't see Lucene using any off heap memory at all for full text search. Does anyone know why and how to get Lucene to use more off heap memory?
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