Mongo shell aggregation pipeline error: "unknown operator: $nor" - database

Question

I'm trying aggregation pipelines for the first time on Mongo Shell following this course. The idea is to create a search query with multiple conditions and use it within a $match aggregation stage.
My aproach was writing the conditions individually and combining them in an object like this:
let fullQuery = {
"languagesQuery" : {
"languages" : {
"$all" : [
"English",
"Japanese"
]
}
},
"genresQuery" : {
"$nor" : [
{
"genres" : "Crime"
},
{
"genres" : "Horror"
}
]
},
"imdbRatingQuery" : {
"imdb.rating" : {
"$gte" : 7
}
},
"ratedQuery" : {
"rated" : {
"$in" : [
"PG",
"G"
]
}
}
}
The thing is that, while individually all the queries seem to work fine, when I run the pipeline or even db.movies.find(fullQuery) I get the following error:
Error: error: {
"operationTime" : Timestamp(1618483194, 1),
"ok" : 0,
"errmsg" : "unknown operator: $nor",
"code" : 2,
"codeName" : "BadValue",
"$clusterTime" : {
"clusterTime" : Timestamp(1618483194, 1),
"signature" : {
"hash" : BinData(0,"LPVJIin4JoThWZbFICVnzHOnJKU="),
"keyId" : NumberLong("6902062171803353090")
}
}
}
Any clue as to what may be happening?

Answer 1

https://docs.mongodb.com/manual/reference/operator/query/nor/ is an expression-level operator, e.g. you can give it on top level of a query to combine clauses. It is not defined as a field-level operator.
For your query, use https://docs.mongodb.com/manual/reference/operator/query/nin/.
The rest of your query looks problematic also in that you should probably be using dot notation for conditions on nested fields and not nesting the fields in the query as you have done.