I am a server-side developer, working on a project which uses a mongo cluster as persistent database.
I have a question for https://mongodb.github.io/mongo-java-driver/3.8/javadoc/com/mongodb/connection/ConnectionPoolSettings.html
It said `to a MongoDB server`
But what if I have a connectionString like following one

mongodb://user:pwd@mongos1:port,mongos3:port,mongos3:port,mongos4:port,mongos5:port,mongos6:port/admin?readPreference=secondaryPreferred

A mongodb sharded cluster which has 6 mongos instance.

Question:
Is the connectionPoolSetting related to one mongos server? or related to all mongos servers?
E.g. if we have maxSize = 10 in this setting, does it mean single client has max connection pool = 10 for single mongos server (max pool = 60 for my 6 mongos cluster)? Or max connection pool = 10 for the whole cluster no matter how many mongos server we have?