KV Store in Splunk 6.3 won't start due to long namespace name

This seems to have started occurring after I upgraded to Splunk 6.3. The KV Store will not start with this error in `mongod.log`: 2015-10-16T15:55:29.724Z W STORAGE [initandlisten] database /var/opt/splunk/var/lib/splunk/kvstore/mongo s_splunkiTR2RCAYp7Go4kZlq1TnMAm9_tSessiV6ysHGNENqOVEZL92qEHLjZQ could not be opened due to DBException 10080: ns name too long, max size is 127 bytes 2015-10-16T15:55:29.739Z I STORAGE [initandlisten] exception in initAndListen: 10080 ns name too long, max size is 127 bytes, terminating The only `collections.conf` files are in the App for Windows Infrastructure and the App for MS Exchange. I have not created any collections of my own, so the collection names are only coming from those apps. Does anyone know how I can track this down? Thanks in advance.