i've tried
mutate {
rename => ["[cookies][mfo]","mfo"]
rename => ["[cookies][mfov]","mfov"]
rename => ["[cookies][plat]","plat"]
}
but there's only a few of entries affected
You need to use a ruby filter for that. I'm pretty sure there are examples of that (or something very similar) in the archives here or on StackOverflow.
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