I’m upgrading from 14.10.5 to 14.10.13 and found this in the logs while the DW was udating the flavor:
Cleaning up unclosed ZipFile for archive /var/lib/xwiki/data/extension/repository/org%2Exwiki%2Eplatform%3Axwiki-platform-distribution-flavor-mainwiki/14%2E10%2E5/org%2Exwiki%2Eplatform%3Axwiki-platform-distribution-flavor-mainwiki-14%2E10%2E5.xar