Currently, I have these MongoDB documents:

{
    "_id" : ObjectId("someId1")
    "employeeId": 1,
    "vehicleName": "accord"
}
{
    "_id" : ObjectId("someId12")
    "employeeId": 1,
    "vehicleName": "camry"
}
{
    "_id" : ObjectId("someId3")
    "employeeId": 2,
    "vehicleName": "civic"
}
{
    "_id" : ObjectId("someId4")
    "employeeId": 2,
    "motorcycleName": "shadow"
}
{
    "_id" : ObjectId("someId5")
    "employeeId": 3,
    "vehicleName": "corolla"
}
{
    "_id" : ObjectId("someId6")
    "employeeId": 3,
    "vehicleName": "elantra"
}
{
    "_id" : ObjectId("someId7")
    "employeeId": 4,
    "vehicleName": "sonata"
}

I am trying to create a query to return the employeeIds that have more than record containing a vehicleName, which in this case is only 1 and 3. I’m not sure if this can be achieved with a simple query however. Does it require an aggregate?