Graylog Downgrade

Hey guys, I updated my Graylog server to version 4.0.1, can I downgrade it to version 3.3.9?

Actually I tried to downgrade, and it works.
Just backup server.conf, most of configuration is stored in mongo, so downgrade will not affect your indexes, inputs, pipelines and so on

May be off topic, but why would you want to downgrade ?

Because there is no group mapping

Thanks for information

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