Elastic search array of objects nested range aggregation - elasticsearch

Question

I'm trying to make range aggregation on the following data set:
{
"ProductType": 1,
"ProductDefinition": "fc588f8e-14f2-4871-891f-c73a4e3d17ca",
"ParentProduct": null,
"Sku": "074617",
"VariantSku": null,
"Name": "Paraboot Avoriaz/Jannu Marron Brut Marron Brown Hiking Boot Shoes",
"AllowOrdering": true,
"Rating": null,
"ThumbnailImageUrl": "/media/1106/074617.jpg",
"PrimaryImageUrl": "/media/1106/074617.jpg",
"Categories": [
"399d7b20-18cc-46c0-b63e-79eadb9390c7"
],
"RelatedProducts": [],
"Variants": [
"84a7ff9f-edf0-4aab-87f9-ba4efd44db74",
"e2eb2c50-6abc-4fbe-8fc8-89e6644b23ef",
"a7e16ccc-c14f-42f5-afb2-9b7d9aefbc5c"
],
"PriceGroups": [
"86182755-519f-4e05-96ef-5f93a59bbaec"
],
"DisplayName": "Paraboot Avoriaz/Jannu Marron Brut Marron Brown Hiking Boot Shoes",
"ShortDescription": "",
"LongDescription": "<ul><li>Paraboot Avoriaz Mountaineering Boots</li><li>Marron Brut Marron (Brown)</li><li>Full leather inners and uppers</li><li>Norwegien Welted Commando Sole</li><li>Hand made in France</li><li>Style number : 074617</li></ul><p>As featured on Pritchards.co.uk</p>",
"UnitPrices": {
"EUR 15 pct": 343.85
},
"Taxes": {
"EUR 15 pct": 51.5775
},
"PricesInclTax": {
"EUR 15 pct": 395.4275
},
"Slug": "paraboot-avoriazjannu-marron-brut-marron-brown-hiking-boot-shoes",
"VariantsProperties": [
{
"Key": "ShoeSize",
"Value": "8"
},
{
"Key": "ShoeSize",
"Value": "10"
},
{
"Key": "ShoeSize",
"Value": "6"
}
],
"Guid": "0d4f6899-c66a-4416-8f5d-26822c3b57ae",
"Id": 178,
"ShowOnHomepage": true
}
I'm aggregating on VariantsProperties which have the following mapping
"VariantsProperties": {
"type": "nested",
"properties": {
"Key": {
"type": "keyword"
},
"Value": {
"type": "keyword"
}
}
}
Terms aggregations are working fine with following code:
{
"aggs": {
"Nest": {
"nested": {
"path": "VariantsProperties"
},
"aggs": {
"fieldIds": {
"terms": {
"field": "VariantsProperties.Key"
},
"aggs": {
"values": {
"terms": {
"field": "VariantsProperties.Value"
}
}
}
}
}
}
}
}
However when I try to do a range aggregation to get shoes in size between 8 - 12 such as:
{
"aggs": {
"Nest": {
"nested": {
"path": "VariantsProperties"
},
"aggs": {
"fieldIds": {
"range": {
"field": "VariantsProperties.Value",
"ranges": [ { "from": 8, "to": 12 }]
}
}
}
}
}
}
I get the following error:
{
"error": {
"root_cause": [
{
"type": "illegal_argument_exception",
"reason": "Field [VariantsProperties.Value] of type [keyword] is not supported for aggregation [range]"
}
],
"type": "search_phase_execution_exception",
"reason": "all shards failed",
"phase": "query",
"grouped": true,
"failed_shards": [
{
"shard": 0,
"index": "product-avenueproductindexdefinition-24476f82-en-us",
"node": "ejgN4XecT1SUfgrhzP8uZg",
"reason": {
"type": "illegal_argument_exception",
"reason": "Field [VariantsProperties.Value] of type [keyword] is not supported for aggregation [range]"
}
}
],
"caused_by": {
"type": "illegal_argument_exception",
"reason": "Field [VariantsProperties.Value] of type [keyword] is not supported for aggregation [range]",
"caused_by": {
"type": "illegal_argument_exception",
"reason": "Field [VariantsProperties.Value] of type [keyword] is not supported for aggregation [range]"
}
}
},
"status": 400
}
Is there a way to "transform" the terms aggregation into a range aggregation, without the need of changing the schema? I know I could build the ranges myself by extracting the data from the terms aggregation and building the ranges out of it, however, I would prefer a solution within the elastic itself.

Answer 1

There are two ways to solve this:
Option A: Use a script instead of a field. This option will work without having to reindex your data, but depending on your volume of data, the performance might suffer.
POST test/_search
{
"aggs": {
"Nest": {
"nested": {
"path": "VariantsProperties"
},
"aggs": {
"fieldIds": {
"range": {
"script": "Integer.parseInt(doc['VariantsProperties.Value'].value)",
"ranges": [
{
"from": 8,
"to": 12
}
]
}
}
}
}
}
}
Option B: Add an integer sub-field in your mapping.
PUT my-index/_mapping
{
"properties": {
"VariantsProperties": {
"type": "nested",
"properties": {
"Key": {
"type": "keyword"
},
"Value": {
"type": "keyword",
"fields": {
"numeric": {
"type": "integer",
"ignore_malformed": true
}
}
}
}
}
}
}
Once your mapping is modified, you can run _update_by_query on your index in order to reindex the VariantsProperties.Value data
PUT my-index/_update_by_query
Finally, when this last command is done, you can run the range aggregation on the VariantsProperties.Value.numeric field.
Also note that this second but will be more performant on the long term.