Using a force transform with "x", "y" forces

Hey all,

I'm using the VEGA visualization in ELK version 7.13.3

I'm trying to draw nodes connected to networks.
I want the x, y coordinates represent the "node_id" and "net_level" respectively, using the force transform.

if I use "static:true" and not using the "x" and "y" forces, it looks great, but if I want to use the "static:false" and try to add the "x", "y" forces, I'm failing.
my guess is I'm using the forces incorrectly.

 "forces": [
            {"force": "x",  "x": {"scale": "x-scale", "field": "datum.node_id"}
            {"force": "y",  "y": {"scale": "y-scale", "field": "datum.net_level"}
            {"force": "nbody"},
            {"force": "link", "links": "link-info"}
          ]

any ideas?

below is the full demo code, that can be used in the VEGA editor, for reference

{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "black",
  "padding": {"top": 150, "left": 100, "bottom": 150, "right": 100},
  "signals": [
    {
      "name": "active",
      "on": [
        {"events": "symbol:click", "update": "datum.node_id"},
        {"events": "symbol:dblclick", "update": "{}"}
      ]
    },
    {"name": "colorIn", "value": "firebrick"},
    {"name": "colorOut", "value": "white"}
  ],
  "data": [
    {
      "name": "network_properties",
      "values": [
        {
          "NetName": "NetType1",
          "net_level": 1,
          "color": "#FDFEFE",
          "width": 2,
          "dashes": [4, 4]
        },
        {
          "NetName": "NetType2",
          "net_level": 1,
          "color": "#FDFEFE",
          "width": 2,
          "dashes": [4, 4]
        }
      ]
    },
    {
      "name": "node-data",
      "values": [
        {
          "key": {"Net": "NetType1", "node_id": "1"},
          "doc_count": 8,
          "node_id": "1",
          "Net": "NetType1",
          "net_level": 1
        },
        {
          "key": {"Net": "NetType2", "node_id": "1"},
          "doc_count": 8,
          "node_id": "1",
          "Net": "NetType2",
          "net_level": 1
        },
        {
          "key": {"Net": "NetType1", "node_id": "2"},
          "doc_count": 8,
          "node_id": "2",
          "Net": "NetType1",
          "net_level": 1
        },
        {
          "key": {"Net": "NetType2", "node_id": "3"},
          "doc_count": 8,
          "node_id": "3",
          "Net": "NetType2",
          "net_level": 1
        }
      ],
      "transform": [
        {"type": "formula", "expr": "datum.key.node_id", "as": "node_id"},
        {"type": "formula", "expr": "datum.key.Net", "as": "Net"},
        {
          "type": "aggregate",
          "groupby": ["node_id"],
          "fields": ["net_level"],
          "ops": ["max"],
          "as": ["net_level"]
        },
        {"type": "identifier", "as": "index"},
        {"type": "formula", "expr": "datum.index-1", "as": "index"}
      ]
    },
    {
      "name": "link-info",
      "values": [
        {"Net": "NetType1", "fromNode": "1", "toNode": "2"},
        {"Net": "NetType1", "fromNode": "2", "toNode": "1"},
        {"Net": "NetType2", "fromNode": "1", "toNode": "3"},
        {"Net": "NetType2", "fromNode": "3", "toNode": "1"}
      ],
      "transform": [
        {
          "type": "formula",
          "expr": "datum.Net + ' ' + datum.fromNode + ' ' + datum.toNode",
          "as": "lookUpKey"
        },
        {
          "type": "lookup",
          "from": "network_properties",
          "key": "NetName",
          "fields": ["Net"],
          "as": ["net_properties"],
          "default": 0
        },
        {
          "type": "lookup",
          "from": "node-data",
          "key": "node_id",
          "fields": ["toNode"],
          "values": ["index"],
          "as": ["target"],
          "default": 0
        },
        {
          "type": "lookup",
          "from": "node-data",
          "key": "node_id",
          "fields": ["fromNode"],
          "values": ["index"],
          "as": ["source"],
          "default": 0
        },
		{
          "type": "formula",
          "expr": "datum.net_properties.color",
          "as": "color"
        },	
		{
          "type": "formula",
          "expr": "datum.net_properties.width",
          "as": "width"
        },			
		{
          "type": "formula",
          "expr": "datum.net_properties.dashes",
          "as": "dashes"
        },			
		{
			"type":"aggregate",
			"groupby":["fromNode","toNode","color","width","dashes","source","target"]
		}
      ]
    },
    {
      "name": "selected",
      "source": "link-info",
      "transform": [
        {
          "type": "filter",
          "expr": "datum.fromNode === active || datum.toNode === active"
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "x-scale",
      "type": "linear",
      "domain": {"data": "node-data", "field": "index"},
      "range": "width"
    },
    {
      "name": "y-scale",
      "type": "linear",
      "domain": {"data": "node-data", "field": "net_level"},
      "range": [390, 0]
    }
  ],
  "marks": [
    {
      "name": "nodes",
      "type": "symbol",
      "zindex": 1,
      "from": {"data": "node-data"},
      "encode": {
        "enter": {
          "fill": {"value": "blue"},
          "stroke": {"value": "white"},
          "x": {"scale": "x-scale", "field": "index"},
          "y": {"scale": "y-scale", "field": "net_level"}
        },
        "update": {
          "size": [
            {"test": "datum.node_id === active", "value": 500},
            {
              "test": "indata('selected', 'fromNode', datum.node_id)",
              "value": 250
            },
            {"value": 100}
          ],
          "fill": [
            {"test": "datum.node_id === active", "signal": "colorIn"},
            {
              "test": "indata('selected', 'fromNode', datum.node_id)",
              "signal": "colorOut"
            },
            {"value": "blue"}
          ],
          "cursor": {"value": "pointer"}
        },
        "hover": {
          "tooltip": {
            "signal": "{'node_id':datum.node_id,'Hier':datum.net_level}"
          },
          "strokeWidth": [{"value": 1}]
        }
      },
      "transform": [
        {
          "type": "force",
          "iterations": 100,
          "restart": false,
          "static": false,
          "signal": "force",
          "forces": [
            {"force": "x", "x":"datum.node_id"},
            {"force": "y", "y":"datum.net_level"},
            {"force": "nbody"},
            {"force": "link", "links": "link-info"}
          ]
        }
      ]
    },
    {
      "type": "path",
      "from": {"data": "link-info"},
      "interactive": false,
      "encode": {
        "update": {
          "stroke": [{"field": "color"}],
          "strokeWidth": [
            {
              "test": "datum.fromNode === active || datum.toNode === active",
              "value": 5
            },
            {"field": "width"}
          ],
          "strokeDash": [{"field": "dashes"}]
        },
        "hover": {"strokeWidth": [{"value": 2}]}
      },
      "transform": [
        {
          "type": "linkpath",
          "require": {"signal": "force"},
          "shape": "curve",
          "sourceX": "datum.source.x",
          "sourceY": "datum.source.y",
          "targetX": "datum.target.x",
          "targetY": "datum.target.y"
        }
      ]
    }
  ]
}