[{"status":"success","results":1,"data":{"following":[{"_id":"5ef4cd0205070d87156e19da","following":{"_id":"5eeb92d69fceed6d91ad5743","name":"X Y"}}]}}]

db.collection.aggregate([{$addFields:{"data.following":{$map:{input:"$data.following",in:"$$this.following"}}}}])