Hi,
We just upgraded our staging env from 6.3.1 to 6.13, and we are seeing an error with some of our custom plugins which looks like the following:
Top Stories Plugin
Subnavigation Plugin

Our Custom Search

I can also post the much longer stack trace, but just from this it seems clear that anything using this Lucene Mapper is now broken (not sure if thats due to sdk library changes or something else).
Any hints or leads would be appreciated, not sure where to start looking for solutions to this