code: @Nonnull
    public ESuccess writeLockedAtomic (@Nonnull final IThrowingRunnable <IOException> aRunnable) throws IOException
    {
      m_aRWLock.writeLock ().lock ();
      try
      {
        if (isClosing ())
        {
          LOGGER.info ("Cannot executed something write locked, because Lucene is shutting down");
          return ESuccess.FAILURE;
        }
        aRunnable.run ();
      }
      finally
      {
        m_aRWLock.writeLock ().unlock ();
      }
      return ESuccess.SUCCESS;
    }
docs: Run the provided action within a locked section.
  
  @param aRunnable
  Callback to be executed
  @return {@link ESuccess#FAILURE} if the index is just closing
  @throws IOException
  may be thrown by the callback