I had to delete and reinstall Filebeat because of some things I did wrong. In the old configuration I had, it gave me some available fields which are also in the new old, even if the pipeline doesn't exist (like host.hostname).
Alongside, when I PUT /_ingest/pipeline/filebeat-7.5.2-system-syslog-pipeline, the old pipeline, it doesn't give me anything even if it worked perfectly on the old one.
Do you know why and how to resolve it ? Thanks a lot.
Actually, I update FIlebeat but it was still looking at the 7.5 version instead of the 7.6. A directory for the 7.6 version was created, but not on the /etc/filebeat/ so I had to move the files to take over the old one.
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