What are recycled-commitlogs?

Cassandra/ScyllaDB I have a node with 51000+ recycled commitlogs and want to know if I can just blitz them. I am Linux not Scylla/Cassandra but these are filling up a datadisk. Normal commitlogs appear to be created and used/removed so I am assuming these are from some failed effort somewhere and may be just copies of existing or commits already run. If these are for commits which have failed and need to be re-done would a restart of the service kickstart a purge? I cannot find anything relating to recycled versions and am hoping some useful individual out there can shed some techlight.