add_field => { "pipeline_ingress" => "$node.name" }
You'd have to make that ${node.name}, but since node.name isn't an environment variable it wouldn't work anyway.
So how can I build a variable that Logstash "can" read?
Assuming you're starting Logstash as a service via systemd or SysV init, setting the variables in /etc/default/logstash should work.
Ok and then reference it, via a Logstash config, like ${variable.name} ?
Yes.
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