When our es cluster upgrade to v7.7,a big change is that the term index(.tip) is not in jvm heap but managed by mmap in pagecache.
Our es cluster have hot data node and cold data node,hot data node used to storage last 7 days and cover 85% query,cold data node storage last 1years and cover a littlt query.
I think the term index is not in heap is good for cold data node to storage more data,but for hot data node,when a 'big query' comes,it may use up the whole pagecache and according to LRU the term index should be remove,it may cause the cluster unstable.
So we are woudering is it a good choice to change the hot data node index.store.type to niofs?What's is the advantages and disadvantages?
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