ElasticSearch - Ordering aggregation by nested aggregation on nested field

问题

{
  "query": {
    "match_all": {}
  },
  "from": 0,
  "size": 0,
  "aggs": {
    "itineraryId": {
      "terms": {
        "field": "iid",
        "size": 2147483647,
        "order": [
          {
            "price>price>price.max": "desc"
          }
        ]
      },
      "aggs": {
        "duration": {
          "stats": {
            "field": "drn"
          }
        },
        "price": {
          "nested": {
            "path": "prl"
          },
          "aggs": {
            "price": {
              "filter": {
                "terms": {
                  "prl.cc.keyword": [
                    "USD"
                  ]
                }
              },
              "aggs": {
                "price": {
                  "stats": {
                    "field": "prl.spl.vl"
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

Here, I am getting error that "Invalid terms aggregation order path [price>price>price.max]. 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. Sub-path [price] points to non single-bucket aggregation"

query works fine if I order by duration aggregation like

"order": [
      {
        "duration.max": "desc"
      }

So is there any way to Order aggregation by nested aggregation on nested field i.e something like below ?

"order": [
      {
        "price>price>price.max": "desc"
      }

回答1:

As Val has pointed out in the comments ES does not support it yet.

Till then you can first aggregate the nested aggregation and then use the reverse nested aggregation to aggregate the duration, that is present in the root of the document.

https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-reverse-nested-aggregation.html

来源：https://stackoverflow.com/questions/43451667/elasticsearch-ordering-aggregation-by-nested-aggregation-on-nested-field