How to use Atlas Search with lookup collections

MongoDB Atlas Atlas Search
,
1

Hi,
I’ve two collection, “users” and “orders”.
users:

[
    {
        "_id":  "6702467ffc13ae106c4fe5e4",
        "firstName": "Laughton",
        "lastName": "Humpatch"
    },
    {
        "_id":  "6702467ffc13ae106c4fe5e5",
        "firstName": "Maurizio",
        "lastName": "Geertje"
    },
    {
        "_id":  "6702467ffc13ae106c4fe5e6",
        "firstName": "Doralia",
        "lastName": "Hunnisett"
    }
]

orders

[
    {
        "_id":  "6702467ffc13ae106c4fe5e7",
        "__user": "6702467ffc13ae106c4fe5e4",
       "amount": 10
    },
    {
        "_id":  "6702467ffc13ae106c4fe5e8",
        "__user": "6702467ffc13ae106c4fe5e6",
       "amount": 20
    },
]

I’d like to filter all orders made by a specific customer but using the power of $search, e.g. passing “Laugh” as string and retrive all orders made by Laughton, so order _id: 6702467ffc13ae106c4fe5e7 .

I need to start the aggregation from orders collection , because of performance and other logic reasons.

If all data I want to search are inside the same collection it works perfectly, but in similar scenario when there are “linked” collections, I really don’t know what do to.

Any help will be appreciated.