iterate objects in java 8 streams - mongodb

Question

I'd like to iterate the following mongo db collection in java8
{ "_id" : ObjectId("59d1dc99a1a79605342f15a7"), "_class" : "com.test.User", "vehicle" : [ { "name" : "aaa", "color" : "blue" } ], "count" : 1,"createdBy" : "Admin", "lastModifiedBy" : "Admin" }
Expected O/P fields:
_id,name,color,count,createdBy
I tried the below
queryvalue.stream().flatMap(vehicle->vehicle.getVehicles().stream()).collect(Collectors.toList());
queryvalue is the one where i'm pulling the data from spring mongo db repository. I'm new to java8 pls help.
Below are the classes:
Class User{
#CreatedDate
protected DateTime createdDate;
#LastModifiedDate
protected DateTime lastModifiedDate;
List<Vehicle> vehicle;
public void setCreatedDate(DateTime createdDate) {
this.createdDate = createdDate;
}
public String getCreatedDate() {
return createdDate;
}
public List<Vehicle> getVehicles() {
return vehicle;
}
public void setVehicle(List<Vehicle> vehicle) {
this.vehicle= vehicle;
}
-- similarly for lastModifieddate and comments etc--
}
Class Vehicle{
private String name;
private string color;
public void setColor(String color){
this.color = color;
return this;
}
public String getColor(){
return color;
}
public void setName(String name){
this.name = name;
return this;
}
public void getName(){
return name;
}
}
And am pulling using this:
List<Vehicle>queryvalue = repository.findByVehicleName(vehiclename);