Nested objects with unique-index - spring

Question

I just moved from mongo 2.0.6 do 3.2 and noticed that the unique-index is now used for nested objects too.
Is there a way to tell mongo to prevent unique-index for nested objects?
I declare the index for the nested-object like #Indexed(unique = true)
Spring version: 4.2.5.RELEASE
Spring-data-mongodb version: 1.8.4.RELEASE
Mongo-driver version: mongo-java-driver 3.2.2
My Code:
package jobs;
import org.springframework.data.mongodb.core.mapping.Document;
#Document(collection = "jobs")
public class Job {
private String title;
private CityInfo cityInfo;
// getter/setter
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public CityInfo getCityInfo() {
return cityInfo;
}
public void setCityInfo(CityInfo cityInfo) {
this.cityInfo = cityInfo;
}
}
package jobs;
import org.springframework.data.mongodb.core.index.Indexed;
import org.springframework.data.mongodb.core.mapping.Document;
#Document(collection = "city_infos")
public class CityInfo {
#Indexed(unique = true)
private String cityName;
// getter/setter
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
}
package jobs;
import org.springframework.data.mongodb.core.MongoOperations;
public class JobMain {
public static void main(String[] args) {
MongoOperations mongo = MongoPoolingUtils.getCentralTemplate();
CityInfo cityInfo = new CityInfo();
cityInfo.setCityName("Berlin");
Job job1 = new Job();
job1.setTitle("java coder");
job1.setCityInfo(cityInfo);
Job job2 = new Job();
job2.setTitle("php coder");
job2.setCityInfo(cityInfo);
mongo.save(job1);
mongo.save(job2);
}
}
Only 1 job is saved to the database.