Vega vertical bar chart: Inline data vs elasticsearch index url data

I created a simple index:

  1. Testing vs inline data - the following works:

  2. The following does not work - Why? - complete source code will follow the illustration.

Here is the complete source code:
{
"$schema": "https://vega.github.io/schema/vega/v3.json",
"width": 400,
"height": 200,
"padding": 5,
"autosize": "pad",

"data": [
{
"name": "table",

  /*  "values": [
    {"category": "A", "amount": 28},
    {"category": "B", "amount": 55},
    {"category": "C", "amount": 43},
    {"category": "D", "amount": 91},
    {"category": "E", "amount": 81},
    {"category": "F", "amount": 53},
    {"category": "G", "amount": 19},
    {"category": "H", "amount": 87}
  ] */
  
  "url": { 
  //  %context%: true
  //  %timefield%: @timestamp
  index: my_newindex
  body: {
    size: 1000
    _source: [ "category", "amount"]
    } 
  }
  
}

],

"signals": [
{
"name": "tooltip",
"value": {},
"on": [
{"events": "rect:mouseover", "update": "datum"},
{"events": "rect:mouseout", "update": "{}"}
]
}
],

"scales": [
{
"name": "xscale",
"type": "band",
"domain": {"data": "table", "field": "category"},
"range": "width",
"padding": 0.05,
"round": true
},
{
"name": "yscale",
"domain": {"data": "table", "field": "amount"},
"nice": true,
"range": "height"
}
],

"axes": [
{ "orient": "bottom", "scale": "xscale" },
{ "orient": "left", "scale": "yscale" }
],

"marks": [
{
"type": "rect",
"from": {"data":"table"},
"encode": {
"enter": {
"x": {"scale": "xscale", "field": "category"},
"width": {"scale": "xscale", "band": 1},
"y": {"scale": "yscale", "field": "amount"},
"y2": {"scale": "yscale", "value": 0}
},
"update": {
"fill": {"value": "steelblue"}
},
"hover": {
"fill": {"value": "red"}
}
}
},
{
"type": "text",
"encode": {
"enter": {
"align": {"value": "center"},
"baseline": {"value": "bottom"},
"fill": {"value": "#333"}
},
"update": {
"x": {"scale": "xscale", "signal": "tooltip.category", "band": 0.5},
"y": {"scale": "yscale", "signal": "tooltip.amount", "offset": -2},
"text": {"signal": "tooltip.amount"},
"fillOpacity": [
{"test": "datum === tooltip", "value": 0},
{"value": 1}
]
}
}
}
]
}

@nyuricks can you please take a stab at it ?

Thanks
Rashmi

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