anchor.diff:                  else 
                       try 
                           work indexWriter
  -                    with e -> cts.Dispose()
  +                    with _ -> cts.Dispose()
                   return! loop delay cts
               }
           loop delay indexWriter.Token
  
positive.code:         /// A hook for extending classes to execute operations after pending 
          /// added and deleted documents have been flushed to the Directory but 
          /// before the change is committed (new segments_N file written).
          override this.doAfterFlush() = 
              /// State can be null when the index writer is opened for the
              /// very first time
              if not (isNull state) then state.IncrementFlushCount() |> ignore
  
negative.code: ﻿namespace FlexSearch.Core
  
  open FlexLucene.Analysis
  open FlexLucene.Analysis.Standard
  open FlexLucene.Codecs.Bloom
  open FlexLucene.Document
  open FlexLucene.Index
  open FlexLucene.Search
  open FlexLucene.Search.Similarities
  open FlexSearch.Core
  open FlexSearch.Core.DictionaryHelpers
  open System
  open System.Collections.Concurrent
  open System.Collections.Generic
  open System.IO
  open System.Threading
  open java.util
  open System.Diagnostics
  open System.Threading.Tasks
  