decompress_gzip_field Failed to decompress field in decompress_gzip_field processor: error decompressing field message: gzip: invalid header

I am trying to decompress a message with the https://www.elastic.co/guide/en/beats/filebeat/current/decompress-gzip-field.html
but it seems that it does not work. I get `error decompressing field gzip: invalid header`

The compression used for this field is unfortunately zlib forced by the following python lib:
https://github.com/keeprocking/pygelf/blob/master/pygelf/gelf.py#L85

and the decompress-gzip-field seems to only accept gzip
https://github.com/elastic/beats/blob/main/libbeat/processors/actions/decompress_gzip_field.go#L108

Please see the history here:
https://stackoverflow.com/questions/20762094/how-are-zlib-gzip-and-zip-related-what-do-they-have-in-common-and-how-are-they

would be nice for decompress_gzip_field processor to accept zlib as well
https://pkg.go.dev/compress/zlib

Love you

Start by reading libbeat/processors/actions/decompress_gzip_field.go at the referenced line and compare its gzip handling with Go's compress/zlib package. Done means the decompress_gzip_field processor accepts the zlib-compressed field produced by pygelf while preserving existing gzip behavior.

Written by the indexing model from the issue text.