Spring - return nested documents using aggregation - mongodb

Question

i have 2 class
class Team
{
#Id
var lateint id : String
var name : String? = null
var stadium : String? = null
var players : List<Players>? = null
}
class Player
{
#Id
var lateint id : String
var firstName : String? = null
var lastName : String? = null
var post : PlayerPost? = null
var number : Int? = null
}
i am trying to get a filtered list of player of a specific team, but i always get a wrong result.
this is my request
val teamCriteria = Criteria.where("_id").`is`(teamId)
val postCriteria = Criteria.where("post").`is`("DEFENDER")
val aggregation = Aggregation.newAggregation(
Aggregation.match(teamCriteria),
Aggregation.unwind("players"),
Aggregation.match(postCriteria),
)
return mongoDb.aggregate(aggregation, Team::class.java, Player::class.java).mappedResults
The problem is instead of getting a list of players as result, i get the team duplicated as the number of expected players..
expected result
[
{
"id" : "id1",
"firstName" : "player1"
"lastName" : "player1",
"number" : 2,
"post" : "DEFENDER"
},
{
"id" : "id2",
"firstName" : "player2"
"lastName" : "player2",
"number" : 3,
"post" : "DEFENDER"
}
]
i always get this result
[
{
"id" : "id1",
"name" : "team name"
"stadium" : "stadium name",
"players" : []
},
{
"id" : "id1",
"name" : "team name"
"stadium" : "stadium name",
"players" : []
}
]
Can sameone tell me what's wrong in my code?