how to get mongoDB documents in priority order - spring

Question

Is there any way to get documents from mongoDB in priority order.
the documents in mongo are indexed like this :
{
"productId":1
},
{
"productId":2
},
{
"productId":4
},
{
"productId":5
},
{
"productId":6
},
{
"productId":7
}
i need to get documents in order as term query order
i try this query but not work :
{
"productId": {
"$in": [
{
"$numberLong": "5"
},
{
"$numberLong": "7"
},
{
"$numberLong": "1"
},
{
"$numberLong": "4"
},
{
"$numberLong": "6"
},
{
"$numberLong": "2"
}
]
}
}
i expect result are documents sorted as term queries order :
{
"productId":5
},
{
"productId":7
},
{
"productId":1
},
{
"productId":4
},
{
"productId":6
},
{
"productId":2
}