In-memory elasticsearch

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?


I noticed that the memory mapped file storage option is still an option (mmapfs). Is that sufficient for your needs?


I am trying to understand the difference between the two. I unfortunately could not find detailed enough documentation about the difference.

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