For the logs not getting printed under upgrade.log, you can cross check the log level for upgrade.log before starting the upgrade. Make sure it is in INFO mode.

While upgrading to 6.5.12, I observed that service "org.apache.jackrabbit.oak.plugins.index.lucene.CopyOnReadStatsMBean" is missing from oak-lucene.jar (1.22.9) and is not registered, because of which the indexCopier is not present and hence NPE is thrown during an OTB job.Any idea what could cause ...

Hi, Did you find any solution for this?