title: Lucene.Net.Index.MergePolicy+MergeException exception in Lucene.net
body: <pre><code>I am using Lucene.net , while indexing I got following exception
  </code></pre>
  
  <p>Application: SysToolsBatchIndexer.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.ThreadHelper.ThreadStart_Context(System.Object)
     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()</p>
  
  <p>Can any one tell me the exact cause of the exception ?</p>