code: func (c *Cluster) Bootstrap(regionID uint64, storeIDs, peerIDs []uint64, leaderPeerID uint64) {
  	c.Lock()
  	defer c.Unlock()
  
  	if len(storeIDs) != len(peerIDs) {
  		panic("len(storeIDs) != len(peerIDs)")
  	}
  	c.regions[regionID] = newRegion(regionID, storeIDs, peerIDs, leaderPeerID)
  }
docs: // Bootstrap creates the first Region. The Stores should be in the Cluster before
  // bootstrap.