How to properly organize work with documents in MongoDB?

Question

NoSQL

I scrape several sites every 5 seconds (PhantomJS), filter the results and put them into documents (PHP). The document looks something like this:

{
"_id" : ObjectId("578e68cb438ca09f7f02e21a"),
"key" {
    "Team1" : "Blue",
    "Team2" : "Red",
    "Archive": false,
        "1469026428" : {
                "Win1" : 1.67,
                "Draw" : 2.07,
                "Win2" : null
            }
}
}

The bottom line is that there comes a time when the document is "obsolete" and it needs to be marked as archived .
Which one is better:

1. Mark one of the fields of the document, and when displaying information, focus on this field, thereby separating archival documents from fresh ones.
   
2. Transfer to another document.
   
3. Other?
   

UDP: I will be glad to any advice and guides.

Answer 1

If you don't need to output archived and simple ones together (in one request), then it's better to transfer them to another collection - you can save a lot on indexes (+ better read, write speed), archived ones can be moved to a slow, cheap server, etc.

Answer 2

Option 1 is generally better.