Where does host.name come from?

Hi! I have fileabeat and logstash to send Nginx data to elasticsearch. I do not have “host.name” field in my logs, but when I discover my index patterns, I see this field. Where does it come from? How does elasticsearch understand the hostname?
Can someone explain this to me?

It's likely coming from Filebeat.

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Could you please explain how it is configured automatically? Can I override it?

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