Zammad 5.x required Elasticsearch 7.8 and higher.
Please check software dependencies before updating - see:
Updating Zammad is described here:
Please note that Elasticsearch has a specific expactation on how to upgrade Elasticsearch - see:
so there is no possibility to install Zammad 4.x from repo?
Sorry but what has this to do with a too old Elasticsearch version?
Downgrading Zammad is not supported nor recommended.
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