My es is 70+nodes and there is an index with a pri shard and 70+ replica shards, because there is no new data written, but there are a lot of queries.
but now, only some of them are 80+ cpu and 20+ load (my node is 16c cpu and 64g mem), more than 80% of nodes are 20-60 cpu. i know a large number of requests only access a few nodes. But I have load balance before ES nodes. how to setting ES and make the cold nodes be used more.