[{"name":"a","locale":"en-GB","insertion_date":{"$date":"2024-04-03T07:00:00.000Z"}},{"name":"b","locale":"en-GB","insertion_date":{"$date":"2024-04-03T07:00:00.000Z"}},{"name":"c","locale":"es-GT","insertion_date":{"$date":"2024-04-03T07:00:00.000Z"}},{"name":"x","locale":"es-GT","insertion_date":{"$date":"2019-01-02T01:00:00.000Z"}},{"name":"y","locale":"en-GB","insertion_date":{"$date":"2019-01-02T01:00:00.000Z"}},{"name":"z","locale":"en-GB","insertion_date":{"$date":"2019-01-02T01:00:00.000Z"}}]

db.collection.aggregate([{$match:{"locale":"en-GB"}},{$sort:{"insertion_date":-1}},{$facet:{docs:[]}},{$project:{docs:{$filter:{input:"$docs",as:"doc",cond:{$eq:["$$doc.insertion_date",{$arrayElemAt:["$docs.insertion_date",0]}]}}}}},{$unwind:"$docs"},{$replaceWith:"$docs"}])