code: public void close(Result<Boolean> result)
    {
      _lifecycle.toDestroy();
      
      SegmentStream nodeStream = _nodeStream;
      _nodeStream = null;
        
      if (nodeStream != null) {
        nodeStream.closeFsync(result.then(v->closeImpl()));
      }
      else {
        result.ok(true);
      }
    }
docs: Closes the store.