[{"id":"1","typeApp":"API","name":"name","versionNum":"1","release":{"author":"name",/**some other data*/}},{"id":"2","typeApp":"API","name":"name","versionNum":"2","release":{"author":"name",/**some other data*/}},{"id":"2","typeApp":"webapp","name":"name","versionNum":"3","release":{"author":"name",/**some other data*/}},{"id":"3","typeApp":"webapp","name":"name","versionNum":"4","release":{"author":"name",/**some other data*/}}]

db.collection.aggregate([{"$sort":{versionNum:-1}},{"$group":{"_id":"$typeApp","data":{"$first":"$$ROOT"}}},{"$replaceRoot":{"newRoot":"$data"}}])