The MongoDB Java sync driver limit stage takes an integer in param and not a long.

So below it should be `limit(3)` instead of `limit(3L)`.

Else it doesn't compile in Java.

You don't have to take my word for it  !

https://mongodb.github.io/mongo-java-driver/3.12/javadoc/com/mongodb/client/model/Aggregates.html#limit(int)