[{"title":"man","articlesType":[{"title":"shoes","articles":[{"title":"shoes1","id":"randomId"},{"title":"shoes2","id":"alsoRandomId"}]}]},{"title":"woman","articlesType":[{"title":"pants","articles":[{"title":"pants1","id":"anotherRandomId"},{"title":"pants1","id":"justId"}]}]}]

db.collection.aggregate([{"$unwind":"$articlesType"},{"$unwind":"$articlesType.articles"},{"$match":{"articlesType.articles.id":"alsoRandomId"}},{"$project":{"title":"$articlesType.articles.title","id":"$articlesType.articles.id"}}])