Elasticsearch huge buff/cache usage

Recently we spotted that our dedicated elasticsearch vm's with 15GB RAM each / 7GB Elasticsearch heap have a huge buff/cache usage. At somepoint it reaches almost 8GB and we have 150MB of free memory on our machine. Is that a normal situation with elasticsearch? This occurs on ingest/data nodes. Master nodes have a lot lower cache.


Hi Zerobot,

This is a normal Linux situation, the Linux kernel uses that RAM for the filesystem cache, see: https://www.linuxatemyram.com/

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