Data Protection in an Aggregation

In order to turn of the display of data in an chart or aggregation if the number of answers falls below a certain threshhold (in this case 5), add these stages above the regular aggregation.

$facet

{
    "count": [
        {
            "$count": "result"
        }
    ],
    "values": [
        {
            "$match": {}
        }
    ]
}

$group

{
    "count": {
        "$first": "$count.result"
    },
    "values": "$values"
}

$redact

{
    "$cond": {
        "if": {
            "$lt": [
                "$count",
                5
            ]
        },
        "then": "$$PRUNE",
        "else": "$$KEEP"
    }
}

$unwind

$replaceRoot