6.2.1: Courier Fetch: 5 of 160 shards failed

After upgrading (it can of course be a coincidence) from 5.6.x to 6.2.1 I get:
"Courier Fetch: 5 of 160 shards failed." when doing attribute.raw:"value" searches. Bug? Any other problem? Nothing in the logs.

There's nothing in the Elasticsearch logs?

nope. I run them in docker which pipes everything to syslog - nothing. I also checked inside the container, there is a logdir with a couple of files, but that's only about gc.

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