Combining Gaussian filter and constant boost factor based on date range filter

filter_range.json

{
  "functions": [
    {
      "field_value_factor": {
        "field": "popularity",
        "modifier": "log2p"
      }
    },
    {
      "filter": {
        "range": {
          "taken_at": {
            "gte": "now-6w/w"
          }
        }
      },
      "gauss": {
        "taken_at": {
          "scale": "4w"
        }
      }
    },
    {
      "filter": {
        "range": {
          "taken_at": {
            "lt": "now-6w/w"
          }
        }
      },
      "boost_factor": 0.119657286
    }
  ]
}