mongo-cxx-driver-legacy版本的客户端不支持连接分片集群？

根据api中提供的ConnectionString类的方式连接mongodb分片集群，报以下错误：

"Cannot list multiple servers in URL without 'replicaSet' option"

mongodb分片集群明显指定不了复制集名称啊，很困惑是否legacy的版本已经不支持分片了，求大师指导有无其他方案？

• Examples:
  *

  • A replica set with three members (one running on default port 27017):
  • string uri = mongodb://localhost,localhost:27018,localhost:27019
    *
  • Authenticated connection to db 'bedrock' with user 'barney' and pwd 'rubble':
  • string url = mongodb://barney:rubble@localhost/bedrock
    *
  • Use parse() to parse the url, then validate and connect:
  • string errmsg;
  • ConnectionString cs = ConnectionString::parse( url, errmsg );
  • if ( ! cs.isValid() ) throw "bad connection string: " + errmsg;
  • DBClientBase * conn = cs.connect( errmsg );