Thanks, that did the trick.

Doing a fresh install on an existing deployment is definitely not a standard procedure, but I am curious whether the upgrade instructions already fully cover this.

I'm not sure whether clearing the /search/ directory is covered in the ant update script. Apart from that, I didn't find any specific instructions to clear the search directory in the upgrade docs:

https://wiki.duraspace.org/display/DSDOC3x/Upgrading+From+1.8.x+to+3.x

I guess we can test this further once the 4.0 release is being cut and when upgrade procedures are revised & tested.