Bucket selection (Elasticsearch 6.8)

Elastic Stack Elasticsearch
1

Hi, I'm running this query

GET assignment/_search?size=0
{
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "user_post": "post"
          }
        },
        {
          "nested": {
            "path": "box",
            "query": {
              "bool": {
                "must": [
                  {
                    "match_all": {}
                  }
                ]
              }
            }
          }
        }
      ]
    }
  },
  "aggs": {
    "objects": {
      "terms": {
        "field": "_id"
      },
      "aggs": {
        "box": {
          "nested": {
            "path": "box"
          },
          "aggs": {
            "box_counts": {
              "value_count": {
                "field": "box.box_id"
              }
            }
          }
        }
      }
    }
  }
}

and i'm getting this result

"aggregations" : {
    "objects" : {
      "doc_count_error_upper_bound" : 0,
      "sum_other_doc_count" : 0,
      "buckets" : [
        {
          "key" : "1_7",
          "doc_count" : 1,
          "box" : {
            "doc_count" : 1,
            "box_counts" : {
              "value" : 1
            }
          }
        },
        {
          "key" : "2_8",
          "doc_count" : 1,
          "box" : {
            "doc_count" : 1,
            "box_counts" : {
              "value" : 1
            }
          }
        },
        {
          "key" : "3_19",
          "doc_count" : 1,
          "box" : {
            "doc_count" : 1,
            "box_counts" : {
              "value" : 2
            }
          }
        },
        {
          "key" : "3_9",
          "doc_count" : 1,
          "box" : {
            "doc_count" : 1,
            "box_counts" : {
              "value" : 1
            }
          }
        },
        {
          "key" : "4_10",
          "doc_count" : 1,
          "box" : {
            "doc_count" : 1,
            "box_counts" : {
              "value" : 1
            }
          }
        }
      ]
    }
  }
}

i want the buckets having box_counts.value >= 2. To achieve this i'm trying to use bucket selector and the query becomes


GET assignment/_search?size=0
{
  "query": {
    "bool": {
      "must": [
        {
          "term": {
            "user_post": "post"
          }
        },
        {
          "nested": {
            "path": "box",
            "query": {
              "bool": {
                "must": [
                  {
                    "match_all": {}
                  }
                ]
              }
            }
          }
        }
      ]
    }
  },
  "aggs": {
    "objects": {
      "terms": {
        "field": "_id"
      },
      "aggs": {
        "box": {
          "nested": {
            "path": "box"
          },
          "aggs": {
            "box_counts": {
              "value_count": {
                "field": "box.box_id"
              }
            },
            "boxes_filter": {
              "bucket_selector": {
                "buckets_path": {
                  "required_value": "box_counts"
                },
                "script": "required_value >= 2"
              }
            }
          }
        }
      }
    }
  }
}

and this results in error with the following message

{
  "error": {
    "root_cause": [],
    "type": "search_phase_execution_exception",
    "reason": "",
    "phase": "fetch",
    "grouped": true,
    "failed_shards": [],
    "caused_by": {
      "type": "class_cast_exception",
      "reason": "class org.elasticsearch.search.aggregations.bucket.nested.InternalNested cannot be cast to class org.elasticsearch.search.aggregations.InternalMultiBucketAggregation (org.elasticsearch.search.aggregations.bucket.nested.InternalNested and org.elasticsearch.search.aggregations.InternalMultiBucketAggregation are in unnamed module of loader 'app')"
    }
  },
  "status": 503
}

kindly help me to achieve the goal

2

I'm also experiencing the same issue, did you find a solution ?

3

I didn't find the correct way to use Bucket Selection, however i got my desired result by adding scripts in query filter (no aggregated function used).

4

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