After struggling for hours why Filebeat can't connect to ES, I realised that this setting in elasticsearch.yaml is the culprit. It is only listening to IPv4 and not IPv6.
network.host: 0.0.0.0
I tried many different ways to add ::/0 to it, but I can't restart ES successfully.
What is the right format to listen to 0.0.0.0 and ::/0 please?
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