Vega animated scatter chart json file url vs elasticsearch index url - (2nd attempt)

[mgolubov55 (Michael Golubov)]

I am adapting the Vega animated scatter chart to display test data.
When the data is loaded from a json file, the chart looks like this:

When the data is loaded from an elasticsearch index, the result is empty data:

Here is a code snippet showing the beginning of the "data" section of the source code:
"data": [

{
"name": "fxtrades",

  // uncommenting the following url displays the data
  // "url": "http://localhost/AnimatedPriceData1.json" 

  // uncommenting the following url results in empty data
  // note: pricescattertest index contains identical data to AnimatedPriceData1.json
  "url": { 
  %context%: true
  %timefield%: @timestamp
  index: pricescattertest-*
  body: {
    size: 10000
     _source: [ "settlementcurrency", "price", "quantity", "monthnum", "mnthname"]
    } 
  }

},

{
  "name": "clusters",
  "values": [
    {"id": 0, "name": "AUS"},

Here is the the first part source: (could somebody tell me why the the elasticsearch index solution is not working):
{
"$schema": "https://vega.github.io/schema/vega/v3.json",
"title": "Animated Scatter plot test - Historical 2018 monthly Max Close price vs Min AdjustedSodPrice",
"background": lightyellow
"width": 1200,
"height":650,
"config": {
"axis": {
"grid": true,
"gridColor": "lightblue",
"labelColor": "#888",
"labelAngle": -45,
"labelPadding": 8,
"titleColor": "blue",
"titleFontSize": 14
},
"legend": {
"padding": 10,
"titleColor": "blue"
}
},
"padding": 5,
"autosize": "pad",

"data": [

{
"name": "fxtrades",

  // uncommenting the following url displays the data
  // "url": "http://localhost/AnimatedPriceData1.json" 

  // uncommenting the following url results in empty data
  // note: pricescattertest index contains identical data to AnimatedPriceData1.json
  "url": { 
  %context%: true
  %timefield%: @timestamp
  index: pricescattertest-*
  body: {
    size: 10000
     _source: [ "settlementcurrency", "price", "quantity", "monthnum", "mnthname"]
    } 
  }

},

{
  "name": "clusters",
  "values": [
    {"id": 0, "name": "AUS"},
    {"id": 1, "name": "BRA"},
    {"id": 2, "name": "CAN"},
	    {"id": 3, "name": "CHN"}, 
    {"id": 4, "name": "HKG"},
    {"id": 5, "name": "IND"},
    {"id": 6, "name": "JPN"},
	    {"id": 7, "name": "KOR"}, 
    {"id": 8, "name": "MYS"},
    {"id": 9, "name": "SGP"},
    {"id": 10, "name": "THA"},
	    {"id": 11, "name": "TWN"}, 
    {"id": 12, "name": "USA"},
 ]
},
{
  "name": "settlementcurrency_timeline",
  "source": "fxtrades",
    //"source": _source,
  "transform": [
    {"type": "filter", "expr": "timeline && datum.settlementcurrency == timeline.settlementcurrency"},
    {"type": "collect", "sort": {"field": "monthnum"}}
  ]
},
{
  "name": "thisMonth",
  "source": "fxtrades",
    // "source": _source,
  "transform": [
    {"type": "filter", "expr": "datum.monthnum == currentMonth"}
  ]
},
{
  "name": "prevMonth",
  "source": "fxtrades",
  // "source": _source,
  "transform": [
    {"type": "filter", "expr": "datum.monthnum == currentMonth - stepMonth"}
  ]
},
{
  "name": "nextMonth",
  "source": "fxtrades",
 // "source": _source,
  "transform": [
    {"type": "filter", "expr": "datum.monthnum == currentMonth + stepMonth"}
  ]
},
{
  "name": "settlementcurrencies",
   "source": "fxtrades",
 // "source": _source,
  "transform": [
    {"type": "aggregate", "groupby": ["settlementcurrency"]}
  ]
},
{
  "name": "interpolate",
  "source": "settlementcurrencies",
  "transform": [
    {
      "type": "lookup",
      "from": "thisMonth", "key": "settlementcurrency",
      "fields": ["settlementcurrency"], "as": ["this"],
      "default": {}
    },
    {
      "type": "lookup",
      "from": "prevMonth", "key": "settlementcurrency",
      "fields": ["settlementcurrency"], "as": ["prev"],
      "default": {}
    },
    {
      "type": "lookup",
      "from": "nextMonth", "key": "settlementcurrency",
      "fields": ["settlementcurrency"], "as": ["next"],
      "default": {}
    },
    {
      "type": "formula",
      "as": "target_price",
      "expr": "interMonth > currentMonth ? datum.next.price : (datum.prev.price||datum.this.price)"
    },
    {
      "type": "formula",
      "as": "target_quantity",
      "expr": "interMonth > currentMonth ? datum.next.quantity : (datum.prev.quantity||datum.this.quantity)" 
    },
    {
      "type": "formula",
      "as": "inter_price",
      "expr": "interMonth==11 ? datum.this.price : datum.this.price + (datum.target_price-datum.this.price) * abs(interMonth-datum.this.monthnum)/1"
    },
    {
      "type": "formula",
      "as": "inter_quantity",
      "expr": "interMonth==11 ? datum.this.quantity : datum.this.quantity + (datum.target_quantity-datum.this.quantity) * abs(interMonth-datum.this.monthnum)/1"
    }
  ]
},
{
  "name": "trackSettlementcurrencies",
  "on": [
    {"trigger": "active", "toggle": "{settlementcurrency: active.settlementcurrency}"}
  ]
}

],

[rashmi (kulkarni)]

@nyuriks