How do I query an AWS OpenSearch index using a Vega visualization? - amazon-web-services

Question

I have data in an index in JSON format, and I want to use a Vega visualization to display this (full Vega, not Vega-Lite). I've found however that every example out there is for Vega-Lite and all they're trying to do it stick their data into a time series graph. I'd like to do something different, and thus I find myself at a dead-end.
A sample doc in my index:
{
"_index": "myindex",
"_type": "doc",
"_id": "abc123",
"_version": 1,
"_score": null,
"timestamp": "2022-05-23T07:43:21.123Z",
"_source": {
"fruit": [{
"amount": 15,
"type": {
"grower_id": 47,
"grower_country": "US",
"name": "apple"
}
},
{
"amount": 43,
"type": {
"grower_id": 47,
"grower_country": "CAN",
"name": "apple"
}
},
{
"amount": 7,
"type": {
"grower_id": 23,
"grower_country": "US",
"name": "orange"
}
},
{
"amount": 14,
"type": {
"grower_id": 23,
"grower_country": "CAN",
"name": "orange"
}
}
]
}
}
What I want to do is create 2 text marks on the visualization that will display the sum of the values as follows.
Symbol1 = sum of all apples (i.e. all apples grown in the US and CAN combined)
Symbol2 = sum of all oranges (i.e. all oranges grown in the US and CAN combined)
I tried the following data element with no success:
"data": [{
"name": "mydata",
"url": {
"index": "myindex",
"body": {
"query": "fruit.type.name:'apple'",
},
}
}
]
However obviously this query isn't even correct. What I want to be able to do is return a table of values and then be able to use those values in my marks as values to drive the mark behaviour or color. I'm comfortable with doing the latter in Vega, but getting the data queried is where I'm stuck.
I've read and watched so many tutorials which cover Vega-Lite, but I'm yet to find a single working example for Vega on AWS OpenSearch.
Can anyone please help?