Database

[{"_id":"600ffd3db893e86a265bc0fa","blpInfoBasica":{"nomIgnoto":"X","emaIgnoto":"X@gmail.com"}},{"_id":"60f1e84ea56a3396b0862504","blpInfoBasica":{"nomIgnoto":"Y","emaIgnoto":"Y@gmail.com"}}]

Query

db.collection.aggregate([{"$project":{"_id":1,"nomIgnoto":"$blpInfoBasica.nomIgnoto","emaIgnoto":"$blpInfoBasica.emaIgnoto"}}])

Result