An example scoreDetails output for $rankFusion right now looks like:

"details" : {
    "value" : 0.030621785881252923,
    "details" : {
        "search" : {
            "rank" : 2,
            "value" : 0.7273834347724915,
            "details" : "Not Calculated"
        },
        "vector" : {
            "rank" : 9,
            "value" : 0.7793490886688232,
            "details" : "Not Calculated"
        }
    }
}

It's not clear, however, how the 0.030621... was computed (via the RRF formula). We should add a "description" field that describes how that value is computed. We can use the $search.scoreDetails.description field (https://www.mongodb.com/docs/atlas/atlas-search/score/get-details/) as an example. 

We'll also add "weight" under each input pipeline to show how the weight plays a role too.