[{"_id":1,"name":"C:"},{"_id":2,"parentFolderId":1,"name":"Users"},{"_id":3,"parentFolderId":2,"name":"<username>"},{"_id":4,"parentFolderId":"3","name":"Desktop"},{"_id":5,"parentFolderId":"4","name":"alpha.tsx"},{"_id":6,"parentFolderId":"1","name":"Program Files"},{"_id":7,"parentFolderId":"1","name":"System32"},{"_id":8,"parentFolderId":"1","name":"Program Files(x86)"}]

db.collection.aggregate([{"$match":{name:"C:"}},/**Make a graph lookup so that update happens on childs*/{$set:{tags:["#new","#cool","#vibes"]}}])