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As someone who has used ElasticSearch in production for years, as far as I know this is simply not true.

That's good for you, but it sounds like you're extrapolating it on just your experience rather than research? Perhaps you've been lucky? Do you really have the info to objectively state it as "simply not true"?

Read the jepsen tests (old but show core problems that aren't fixed):

https://aphyr.com/posts/317-call-me-maybe-elasticsearch

https://aphyr.com/posts/323-call-me-maybe-elasticsearch-1-5-...

Or just search for ES data loss:

https://news.ycombinator.com/item?id=9475620

https://stackoverflow.com/questions/29841348/how-reliable-is...

And if that's not enough, here's the official page listing several "ongoing" fixes for major durability issues:

https://www.elastic.co/guide/en/elasticsearch/resiliency/cur...

After reading the links you gave, I’d like to clarify that I meant that edge cases that can cause data loss are not common enough, in my experience, for one to be forced to treat ElasticSearch as an unreliable data store. Anecdotally, I’ve never seen it happen. You’re right, maybe I’m lucky; I would like to see a case study of some project where these issues were significant enough to treat ElasticSearch as an unreliable data store.

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