Trying to get a basic map of USA States to show up via vega. With the following code, I am getting the error "emsfile "USA States" does not exist"
Any idea what the emsfile should be, or what could be wrong:
    {
      "$schema": "https://vega.github.io/schema/vega/v5.json",
      "config": {"kibana": {"type": "map", "latitude": 40, "longitude": -97, "zoom": 4}},
      "data": [
        {
          "name": "usastates",
          "url": {"%type%": "emsfile", "name": "USA States"},
          "format": {"type": "json", "property": "features"}
        },
        {
          "name" : "statescount",
          "values" : [
            { "state" : "NY", "count" :"100"},
            { "state" : "CA", "count" : "400"},
            { "state" : "NJ", "count" : "25"}
          ]
        }
      ],
      "marks": [
        {
          "type": "shape",
          "from": {"data": "usastates"},
          "transform": [{"type": "geoshape", "projection": "projection"}]
        }
      ]
    }