{
  "_embedded": {
  "users": [
    {
      "email": "some_email@gmail.com",
      "name": "some name",
      "id": "57420b2a0d31bb6cef4ee8e9"
    },
    {
      "email": "some_other_email@gmail.com",
      "name": "some other name",
      "id": "57420f340d31cd8a1f74a84e"
    }
  ]
}

{
  "email": "some_other_email@gmail.com",
  "name": "some other name",
  "address": "1234 foo street"
  "gender": "female"
  "id": "57420f340d31cd8a1f74a84e"
}

public class User {

    private String id;
    private String email;
    private String address;
    private String name;
    private String gender;

...
}

@Projection(name="personSummary", types={Person.class})
public interface PersonSummary {
    String getEmail();
    String getId();
    String getName();
}

@RepositoryRestResource(excerptProjection = PersonSummary.class)
public interface PersonRepository extends CrudRepository<Person, String> {}

public interface PersonRepository extends MongoRepository<Person, String>

  @Query(value="{ 'firstname' : ?0 }", fields="{ 'firstname' : 1, 'lastname' : 1}")
  List<Person> findByThePersonsFirstname(String firstname);

}