Patches over a race condition in recovery, and adds a stack trace to help further debugging.
Added clarifying comment to IndexingService about recovering constraint indexes.
Improved error reporting for file lock failures.
Fixes issue with adding 80+ labels and removing 20+ of them in the same tx.
Improved logging for failure on rollback.
Merge pull request #1577 from jakewins/fix-ha-robustness-issues

Fix ha robustness issues