Is there a limit as to how many documents a single index can have?

I'm new to Elasticsearch and I'm wondering as to how many documents I can have in a single index. I'm looking to have around 60-120 million documents of a single type in a single index. Are the documents stored in the disk?

While we're at it, as per what I've read in the documentation, I should not allocate more than 1/4 of my RAM to Elasticsearch. When does Elasticsearch use the RAM? While querying? If so, would having 2-3 nodes in the same cluster help during memory intensive processes?

Two billion.


1/2, yes.

It's a JVM process, so pretty much as soon as you start it.

Yes definitely.

Many thanks for your response.

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