I have a find query that uses $in to check whether the specified array is contained within the collection string array:

`db.Doc.find({ tags: { '$in': ['tag1','tag2'] } })`

I am in the process of refactoring this query to use the aggregation framework, but I can't find the equivalent `$in` comparison operator at the `$project` or `$match` aggregation stages.

Is it possible to use the `$in` comparison operator at the `$project` or `$match` stages of an aggregation query.