Exception Info: Lucene.Net.Index.MergePolicy+MergeException

While trying to convert items into buckets, my w3wp process started crashing randomly. Looking at the Event Viewer I saw the following error:

Application: w3wp.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: Lucene.Net.Index.MergePolicy+MergeException
Stack:
   at Lucene.Net.Index.ConcurrentMergeScheduler.HandleMergeException(System.Exception)
   at Lucene.Net.Index.ConcurrentMergeScheduler+MergeThread.Run()
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
   at System.Threading.ThreadHelper.ThreadStart()

I assumed the issue was related to indexes but rebuilding the index did not solve the problem.

Fix: I had to actually delete the index files and re-index everything and that seems to have worked. 

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