Elasticsearch - aggregate over filtered data - elasticsearch

Question

I have a query that returns a set of documents (100). Over these I want to apply an aggregation, because these are most relevant. When I try to aggregate, that returns aggregations over all results, not over the first 100.
Query:
{
"size": 100,
"sort": [
{
"_score": {
"order": "desc"
}
}
],
"from": 0,
"query": {
.......
},
"aggregations": {
"category.category_id": {
"nested": {
"path": "category"
},
"aggregations": {
"category.category_id": {
"terms": {
"field": "category.category_id",
"size": 2,
"order": {
"_count": "desc"
}
}
}
}
}
}
Result:
{
"took": 33,
"timed_out": false,
"_shards": {
"total": 4,
"successful": 4,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1042,
"max_score": 60,
"hits": [...100 hits...]
},
"aggregations": {
"category.category_id": {
"doc_count": 5186,
"category.category_id": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 196,
"buckets": [
{
"key": 2,
"doc_count": 1042
},
{
"key": 2764,
"doc_count": 272
}
....
]
}
}
}
Expected:
{
"took": 33,
"timed_out": false,
"_shards": {
"total": 4,
"successful": 4,
"skipped": 0,
"failed": 0
},
"hits": {
"total": 1042,
"max_score": 60,
"hits": [...100 hits...]
},
"aggregations": {
"category.category_id": {
"doc_count": 100,
"category.category_id": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": x,
"buckets": [
{
"key": 2,
"doc_count": x (x< 100) (eg 37)
},
{
"key": 2764,
"doc_count": y (y <= 100 -x) (eg 10)
}
....
]
}
}
}
Is possible to aggregate over filtered data? or haw can I aggregate over most relevant data?

Answer 1

You can use a filter aggregation as described by elasticsearch documentation
{
"aggs" : {
"agg_name" : {
"filter" : { //Add your query },
"aggs" : {
"terms": {
"field": "category.category_id",
"size": 2,
"order": {
"_count": "desc"
}
}
}
}
}
If you want you can add one more aggregation inside the 2nd aggs