CDFO6XRLJL - Fixed the following error "Extendible hash index is corrupt and can't be used" that...

SPR# CDFO6XRLJL - Fixed the following error "Extendible hash index is corrupt and can't be used" that happens periodically during use such that it no longer crashes the client.This is an internal condition where the conversation threads cache gets compromised and has to be rebuilt. This can result in sudden system shutdowns, client crashes, etc. The client will rebuild the cache in the background so the user really doesn't need to see this message.