Tooltip not working with Vertical Bar Chart (Vega)

I am trying to plot the data in a vertical bar chart and I've followed this writeup.

The only difference is that I'm trying to fetch the data directly via a Elasticsearch Query.

However, I'm unable to get the Tooltip working. Here's my Vega Visualisation Code
{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"width": 400,
"height": 200,
"padding": 5,

      data:{
        name: "ES_DATA",
        url:{
            %context%: true
             "index": "Students",
             "body":{
               "size": 2000,
                "_source": ["Name","Age","Gender","DOB"]
            }
          }
          format: { property: "hits.hits" }
      }
      transform: [
        // Since @timestamp is a string value, we need to convert it to a unix timestamp
        // so that Vega can work on it properly.
        {
          // Convert _source.@timestamp field to a date
          calculate: "toDate(datum._source['DOB'])"
          // Store the result in a field named "time" in the object
          as: "time"
        },
        {calculate: "datum._source.Name", as: "Name"},
    {calculate: "datum._source.Age", as: "Age"}
        
      ]
      


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

      "scales": [
        {
          "name": "xscale",
          "type": "band",
          "domain": {"data": "ES_DATA", "field": "_source.Name"},
          "range": "width",
          "padding": 0.05,
          "round": true
        },
        {
          "name": "yscale",
          "domain": {"data": "ES_DATA", "field": "_source.Age"},
          "nice": true,
          "range": "height"
        }
      ],

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

      "marks": [
        {
          "type": "rect",
          "from": {"data":"ES_DATA"},
          "encode": {
            "enter": {
              "x": {"scale": "xscale", "field": "_source.Name"},
              "width": {"scale": "xscale", "band": 1},
              "y": {"scale": "yscale", "field": "_source.Age"},
              "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.Name", "band": 0.5},
              "y": {"scale": "yscale", "signal": "tooltip.Age", "offset": -2},
              "text": {"signal": "tooltip.Age"},
              "fillOpacity": [
                {"test": "isNaN(tooltip.Age)", "value": 0},
                {"value": 1}
              ]
            }
          }
        }
      ]
    }

I'm able to render the data in both X and Y axes but I'm unable to make the tooltip work (I don't see any data on hovering, although it works perfectly in the tutorial). What am I missing?

P.S. - Please let me know if my question stands unclear on any aspect. I'd try to explain it all over again.

Welcome @Daggerhunt! What version of Kibana are you using? Tooltip support was added in Kibana version 6.4. Please take a look at this PR for more details as well as an example. Also, I noticed in your example the $schema points to v5. Per the documentation, Kibana currently supports Vega version 4.3.

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