See https://docs.mongodb.com/manual/reference/operator/query-logical/ .

$or operator
------------

Find movies whose IMDb score is at least 8.5 or its Tomato meter
is at least 90.

    db.movieDetails.find({$or: [
        {"imdb.rating": {$gte: 8.5}},
        {"tomato.meter": {$gte: 90}}
    ]})