docs: @SuppressWarnings("unchecked")
      @IocBean(name = "mongoClient")
      public MongoClient createMongoClient() {
          // 如果配的是URL,直接返回了
          if (conf.containsKey(PROP_URI)) {
              return new MongoClient(new MongoClientURI(conf.get(PROP_URI)));
          }
          return new MongoClient(ioc.get(List.class, "mongodbServerAddressList"), ioc.get(List.class, "mongodbCredentialList"), ioc.get(MongoClientOptions.class));
      }