Spring data MongoDb: MappingMongoConverter remove _class

The default MappingMongoConverter adds a custom type key ("_class") to each object in the database. So, if I create a Person:

package my.dto;
public class Person {
    String name;
    public Person(String name) {
        this.name = name; 
    }
}

and save it to the db:

MongoOperations ops = new MongoTemplate(new Mongo(), "users");
ops.insert(new Person("Joe"));

the resulting object in the mongo will be:

{ "_id" : ObjectId("4e2ca049744e664eba9d1e11"), "_class" : "my.dto.Person", "name" : "Joe" }

Questions:

1. What are the implications of moving the Person class into a different namespace?

2. Is it possible not to pollute the object with the "_class" key; without writing a unique converter just for the Person class?