Text search not working on dynamic values

Working with Data
, , ,
1

Hi, I am getting no results from my search query. Unable to debug the issue

Index :

{
      'product.productName.*': 'text'
    }

Sample Document :

{
"product":{
        "productName" : {
            "en-gb" : "Rocket Dog Womens Berry Lewis Boots",
            "fr-fr" : "Rocket Dog Bottes Berry Lewis"
        }
}
}

^^ the locales inside the productName obj can change from product to product, hence the wildcard index

Query :

db.getCollection('products').find({$text:{$search:'Rocket'}})

This works when i do a direct query. Any help debugging this would be greatly appreciated!
Mongod version 7.0.15. And the collection has around 300000+ documents