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I’m not sure it’s possible or desirable to make a low memory search index. Like, fundamentally you’re going to want the indexes in RAM for performance, no?

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Depends on the search volume and performance requirements. For lots of (most?) applications, you don't want all the indices in RAM.

(But I guess a lot of the bloat with ES is also the 3+ node cluster which includes lots of redudancy, and resulting redundant use of RAM as well?)

If you don't want/need HA you can run a 1 node ES.

Yeah, but for that you want to make the most efficient use of the available RAM, no?

I would suspect there to be some room for improvement.

There is tons of room for improvement, did you improve it? As in, did you tune ES to your specific hardware and search needs?

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