Hi @Yook_20450,
Sorry, I’m just reading this now.
When a document is deleted from MongoDB (by a TTL or not), it’s the same result in the oplog. I provided an example in this topic above to explain how a document could be “saved” using the oplog, but it would only work if the oplog is large enough so it still contains the entry that created this doc. If that’s the case, then it will also contain all the following updates that may have occurred to this doc.
Else it’s lost if you don’t have a backup. 
Cheers,
Maxime.