I am seeing the exact same issue as this (4.5 Enterprise). I did manage to delete the index and restart the server and when I tried to recreate the index again, it gets “stuck” and I am seeing the “Warning: Cannot communicate with indexer process. Information on indexes may be stale. Will retry.” message without even seeing the index in the list.
Seems like somehow the index process is screwed up somewhere, but I am not sure where to start fixing it (except by uninstall and reinstall (which is a pain but is possible - it’s a test environment). But that won’t really help me avoid the problem in the future.
Any help would be appreciated.