code: func (m *Migrator) activateBoltStore() error {
  	op := "Moving Bolt file into place"
  	m.sendProgress(op, 0, 1)
  
  	if err := os.Rename(m.boltTempPath, m.boltPath); err != nil {
  		return err
  	}
  
  	m.sendProgress(op, 1, 1)
  	return nil
  }
docs: // activateBoltStore wraps moving the Bolt file into place after
  // a data migration has finished successfully.