Heatmap nested faceting (or similar result)

[nicolas n]

Hello everyone !

I would like to be able to produce a heatmap based on something else than the 
total count of index in each cell, like the example below (get an heatmap with 
average population age instead of juste population count for each cell) :

Query :
{
    "avg_age_heatmap": {
        "type": "heatmap",
        "geom": "[-180 -90 TO 80 90]",
        "gridLevel": 1,
        "field": "house coordinates",
        "aggregationFunc": "avg"
        "facet": {
            "age": {
                "type": "range",
                "field": "age",
                "start": 0,
                "end": 120,
                "gap": 1
            }
        }
    }
}

Result :
{
    "facets": {
        "count": 999,
        "avg_age_heatmap": {
            "gridLevel": 1,
            "columns": 8,
            "rows": 4,
            "minX": -180.0,
            "maxX": 180.0,
            "minY": -90.0,
            "maxY": 90.0,
            "counts_ints2D": [
                [
                    80,
                    26, => average population age in this cell
                    35,
                    19,
                    0,
                    42,
                    32,
                    30
                ],
        }
    }
}

I know that the nested facet inside heatmap is not supported yet, but does 
anyone know if this is feature is planned for a futur release ? Or is there any 
other mean that I did not think about to get this kind of result ?

Have a good day !

Nicolas