[9.1] (backport #11348) Set max_shards_per_node to 2000 for the integration test cluster #11350
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Our integration tests create a lot of indices due to each test running in its own namespace. Increase the limit, as the performance penalty doesn't matter for the purpose of our tests. (cherry picked from commit 81150c8)
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Our integration tests create a lot of indices due to each test running in its own namespace. Recently, we've been hitting the per-node cluster wide limit of 1000 shards, causing some tests to randomly be flaky - see #11325 for example.
I've looked into this in #11329, and it does look like we create almost 500 indicies, each of which gets an inactive replica shard that counts towards the limit. I tried to disable replication at first, but doing so for managed indices turns out to be a huge pain. Instead, I decided to just increase the limit, as the replica shards aren't really doing much anyway.
This is an automatic backport of pull request #11348 done by [Mergify](https://mergify.com).