REST API timing out when an Elastic node dies

I’ve been wondering what is wrong with my v3.3.5 setup.

My server.conf contains nodes of my Elastic cluster: elasticsearch_hosts = http://<es-node-1-IP>:9200,http://<es-node-2-IP>:9200,http://<es-node-3-IP>:9200.

One of the Elastic nodes died yesterday. The rest of the cluster should survive. But still requests on Graylog REST API (particularly to /api/search/universal/absolute) timed out.

Naïvely, I’d assume Graylog should round-robin to the rest of Elastic nodes. I can’t prove two remaining nodes from the cluster worked OK, but still.

Am I missing something obvious?

Bump, anybody? Thanks

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