"Unrecognized expression '$toInt'"

I always get this error while trying to convert string to int. Expression is
db.movies.aggregate([$addFields: {"num_awards": {$toInt: "$num_awards.1"}}])

Please take a look at:

https://docs.mongodb.com/manual/reference/operator/aggregation/toInt/

I’ve already gone through that. Thanks.
The thing is you’ve pointed me to the documentation of mongoDB version 4.0 whereas the cloud version used in this course is 3.6.9 and the $toInt() wasn’t introduced until version 4.0.

Probably that’s why I got an error,the syntax is right,otherwise.

Thanks,
Apurva

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