code: func (m *Migrator) boltConnect(file string) error {
  	// Connect to the new BoltStore
  	store, err := raftboltdb.NewBoltStore(file)
  	if err != nil {
  		return err
  	}
  
  	m.boltStore = store
  	return nil
  }
docs: // boltConnect creates a new BoltStore to copy our data into. We can
  // use the BoltStore directly because it provides simple setter
  // methods, provided our keys and values are known.