ElasticSearch - Sort on the subaggregation - sorting

Question

I am quite new to elasticsearch, I am trying to sort on a subaggregations. that is my results should be sorted based on the sub aggregations first. I have tried lot of things to enable this sort but it isn't working. Can anyone help with this?
{
"aggs": {
"distinct_part": {
"terms": {
"field": "part",
"size": 1000
}
},
"aggs": {
"distinct_manufacturer": {
"terms": {
"field": "manufacturer",
"size": 1000
}
}
}
}
I am trying to sort on the manufacturer, my entire result should be sorted on that? Can someone point me on how I can achieve that?

Answer 1

I tried to do a test locally with your query. I did a small correction if I understood your issue well. I ingested the following data in the index "subsorting":
"part": "car",
"manufacturer": "brandA"
"part": "car",
"manufacturer": "brandB"
"part": "car",
"manufacturer": "brandC"
"part": "motor",
"manufacturer": "brandA"
"part": "motor",
"manufacturer": "brandB"
"part": "motor",
"manufacturer": "brandC"
Note: Both part and manufacturer are mapped as text.
GET subsorting/_search
{
"size": 0,
"aggs": {
"distinct_part": {
"terms": {
"field": "part.keyword",
"size": 1000
},
"aggs": {
"distinct_manufacturer": {
"terms": {
"field": "manufacturer.keyword",
"order": {
"_key": "asc"
},
"size": 1000
}
}
}
}
}
}
If both fields "part" and "manufacturer" are mapped as keywords, remove the ".keywords" from the query.
The response from the above query is as follows if sorted as ascending order:
"aggregations" : {
"distinct_part" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "motor",
"doc_count" : 4,
"distinct_manufacturer" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "brandA",
"doc_count" : 2
},
{
"key" : "brandB",
"doc_count" : 1
},
{
"key" : "brandC",
"doc_count" : 1
}
]
}
},
{
"key" : "car",
"doc_count" : 3,
"distinct_manufacturer" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "brandA",
"doc_count" : 1
},
{
"key" : "brandB",
"doc_count" : 1
},
{
"key" : "brandC",
"doc_count" : 1
}
]
}
}
]
}
}
If you need the result as descending order, here is the response where "_key": "desc":
"aggregations" : {
"distinct_part" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "motor",
"doc_count" : 4,
"distinct_manufacturer" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "brandC",
"doc_count" : 1
},
{
"key" : "brandB",
"doc_count" : 1
},
{
"key" : "brandA",
"doc_count" : 2
}
]
}
},
{
"key" : "car",
"doc_count" : 3,
"distinct_manufacturer" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "brandC",
"doc_count" : 1
},
{
"key" : "brandB",
"doc_count" : 1
},
{
"key" : "brandA",
"doc_count" : 1
}
]
}
}
]
}
}
Links:
https://www.elastic.co/guide/en/elasticsearch/reference/7.9/search-aggregations-bucket-terms-aggregation.html