Elasticsearch 1.5 has the option of using memory storage type.
If I understand correctly, when this option is chosen, all data will be store in the RAM?
If that is the case, why was this option removed in future versions, and if there is any equivalent?
Also how does that compare to mmapfs?
References:
https://www.elastic.co/guide/en/elasticsearch/reference/1.5/index-modules-store.html
https://www.elastic.co/guide/en/elasticsearch/reference/6.3/index-modules-store.html