[{"_id":ObjectId("6201396b866ffbf1b84fb8f9"),"title":"ironman","comments":[{"text":"nihao","replies":[{"text":"hi"},{"text":"bonjour"},{"text":"push replies!!!"}]},{"text":"what??","replies":[{"text":"the"},{"text":"hey"}]},{"text":"push comments!!!"}]}]

db.collection.update({title:"ironman"},{$set:{"comments.$[comment].replies.$[reply].text":"hello"}},{arrayFilters:[{"comment.replies":{$exists:true}},{"reply.text":"hi"}]})