Just as an anecdote to the jepsen test findings, I’ve used elasticsearch at two jobs as a primary datasource and haven’t had data loss as mentioned in the tests

Just as an anecdote to the jepsen test findings, I’ve used elasticsearch at two jobs as a primary datasource and haven’t had data loss as mentioned in the tests. The tests are, at this point, pretty old and I’ve found that newer versions are pretty good at controlling data loss. As a counterpoint, mongo also still has some outstanding issues with jepsen tests, but they are working on being compliant. Honestly, as far as resiliency, I’m not sure either has solved the problem perfectly.