clientv3/concurrency/election.go
func NewElection(s *Session, pfx string) *Election {
	return &Election{session: s, keyPrefix: pfx + "/"}
}
func NewElection(s *Session, pfx string) *Election {
	return &Election{session: s, keyPrefix: pfx + "/"}
}
// NewElection returns a new election on a given key prefix.