在嵌套文档下添加文档

Question

我需要再添加一个地址，例如address.2._id,type等......：

{
    "address" : {
        "1" : {
            "_id" : ObjectId("5a570f3d422c8223bac22dca"),
            "type" : "Primary",
            "street" : "58,Jones road",
            "area" : "Saidapet",
            "city" : "Chennai",
            "pincode" : "600015",
            "state" : "Tamil nadu",
            "country" : "India"
        }
    }
}

如何在嵌套文档下插入特定文档？