This worked. Query look something like this:
{
"query":{
"match_all":{}
},
"aggs": {
"categories": {
"nested": {
"path": "categories"
},
"aggs": {
"key": {
"terms": {
"field": "categories.key",
"include" : "f.*"
},
"aggs": {
"value": {
"terms": {
"field": "categories.value"
}
}
}
}
}
}
}
}
It is nested query with bucketing by categories.key and then aggregating
by categories.value. For this to work, categories field has to have "type":
"nested" in mapping.json:
"categories": {
"type": "nested",
"properties": {
"key": {
"type": "string"
},
"value": {
"type": "string"
}
}
}
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