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Consider improving Logstash configs in the docs/static/filebeat_modules/*/*.conf #8527
These configs are part of the "adding Logstash to filebeat modules getting started experience" and therefore its very likely the first time a user will see a LS config.
For the best experience we should add a fair few comments to better inform what is going on. The user sees the nested field reference for the first time and there is a try three grok pattern scheme with two mutate renames that work only if earlier grok patterns fail that could be explained better.
Optionally, we could add anchors to Grok patterns.