clientv3/concurrency/election.go
func ResumeElection(s *Session, pfx string, leaderKey string, leaderRev int64) *Election {
	return &Election{
		keyPrefix:     pfx,
		session:       s,
		leaderKey:     leaderKey,
		leaderRev:     leaderRev,
		leaderSession: s,
	}
}
func ResumeElection(s *Session, pfx string, leaderKey string, leaderRev int64) *Election {
	return &Election{
		keyPrefix:     pfx,
		session:       s,
		leaderKey:     leaderKey,
		leaderRev:     leaderRev,
		leaderSession: s,
	}
}
// ResumeElection initializes an election with a known leader.