The old UI has the option "release all locks" in the status page.
It delegates to Data.lockReleaseAll()
Ironically, Data.lockReleaseAll() does nothing because there's no such method like LockingManager.releaseAll() in GeoTools, so it just iterates the datastores, grabs their LockingManagers and does nothing.
Understandably, there's no replacement for Data.lockReleaseAll() in the new configuration's Catalog
So we should either remove this option from StatusPage or see what to do about GeoTools' LockingManager.releaseAll()