Where does ElasticSearch store data?

Question

Database

Hello!
There is a task of fast search of the data in different entities. There is a lot of data, according to my calculations, the denormalized part of this data, which will be stored in ElasticSearch, will be about 30 GB.
The question is - where does ElasticSearch store this data for quick search - on the hard disk or in RAM?

Answer 1

Well, it's stored on disk.
but after accessing the data, it will cache in memory https://www.elastic.co/guide/en/elasticsearch/guid...
https://www.elastic.co/guide/en/elasticsearch/refe...
to By the way, do not forget about the limit of 31G per node.

Answer 2

And why did they choose him? Are there many other alternatives on the market?