Sorting after aggregation in Elasticsearch

Question

I have docs with this structure:

{
    FIELD1:string,
    FIELD2:
        [ {SUBFIELD:number}, {SUBFIELD:number}...]
}

I want to sort on the result of the sum of numbers in FIELD2.SUBFIELDs:

GET myindex/_search
{
  "size":0,
  "aggs": {
    "a1": {
      "terms": { 
        "field": "FIELD1",
        "size":0
      },
      "aggs":{
        "a2":{
          "sum":{
            "field":"FIELD2.SUBFIELD"
          }
        }
      }
    }
  }
}

If I do this I obtain buckets not sorted, but I want buckets sorted by "a2" value. How I can do this? Thank you!

Val · Accepted Answer · 2015-06-10 14:57:47Z

79

You almost had it. You just need to add an order property to your a1 terms aggregations, like this:

GET myindex/_search
{
  "size":0,
  "aggs": {
    "a1": {
      "terms": { 
        "field": "FIELD1",
        "size":0,
        "order": {"a2": "desc"}      <--- add this
      },
      "aggs":{
        "a2":{
          "sum":{
            "field":"FIELD2.SUBFIELD"
          }
        }
      }
    }
  }
}

answered Jun 10, 2015 at 14:57

Val

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5 Comments

Val Over a year ago

@ErdalG. the documentation or ordering terms aggregations is here

Saeed Zhiany Over a year ago

@Val this is not working when a2 is a scripted_metric aggregation. I used it for my cases that I have to use scripted_metric aggregation. I got this error

"reason": {                     "type": "aggregation_execution_exception",                     "reason": "Invalid terms aggregation order path [totalViews]. Terms buckets can only be sorted on a sub-aggregator path that is built out of zero or more single-bucket aggregations within the path and a final single-bucket or a metrics aggregation at the path end."                 }

Val Over a year ago

@saeedzhiany Correct, there's an open PR and an open issue about this.

Saeed Zhiany Over a year ago

@Val, is there any alternate for this sort? I really need it

Val Over a year ago

@saeedzhiany not that I know of. Usually, people sort on the client side. Feel free to ask a new question, maybe someone has an idea.

Jon R · Accepted Answer · 2020-01-14 05:26:55Z

8

Brilliant from Val https://stackoverflow.com/users/4604579/val

Basically the same thing, but here's what worked for me to find the largest "size" for each "name", and to show the top 25 largest:

{
  "size": 0,
  "aggs": {
    "agg1": {
      "terms": {
        "field": "name.keyword",
        "order": {
          "agg2": "desc"
        },
        "size": 25
      },
      "aggs": {
        "agg2": {
          "max": {
            "field": "size"
          }
        }
      }
    }
  }
}

answered Jan 14, 2020 at 5:26

Jon R

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