Mongoose include fields from a secondary document using $lookup

I want to display all of the locations and attach orders (if there are any) to the response.

Locations document example:

{
  id: "LOCATION_A_OBJECTID",
  name: "Location A"
},
{
  id: "LOCATION_B_OBJECTID",
  name: "Location B"
},
{
  id: "LOCATION_C_OBJECTID",
  name: "Location C"
}

Orders document example: (2 orders to A, 1 order to B, 0 orders to C)

{
  id: "5e17a001f1e0220def7a2b5d",
  location: "LOCATION_A_OBJECTID", 
  products: [1,2,3]
},
{
  id: "5e17a001f1e0220def7a2b5d",
  name: "LOCATION_B_OBJECTID",
  products: [1,2,3]
},
{
  id: "5e17a001f1e0220def7a2b5d",
  name: "LOCATION_A_OBJECTID",
  products: [1,2,3]
}

Expected result:

{
  id: "LOCATION_A_OBJECTID",
  name: ...
  products: ...
   ...
},
{
  id: "LOCATION_B_OBJECTID",
  name: ...
  products: ...
  ...
}
...

Edit Will post my schemas here because something is just not right.

Order Schema

const mongoose = require('mongoose')
const orderSchema = mongoose.Schema({
  location: {
    type: mongoose.Schema.Types.ObjectId
  },
  timestamp: {
    type: Date, default: Date.now
  },
  status: Number,
  products: Array,
  total:   Number
})
module.exports = mongoose.model('Order', orderSchema)

Location Schema:

const mongoose = require('mongoose')
const locationSchema = mongoose.Schema({
  name: String,
  address: String
})
module.exports = mongoose.model('Location', locationSchema)