根据不同文档中相同字段的不同值进行过滤

Question

Let's say I have the following data:

{
  "id":"1",
  "name": "John",
  "tag":"x"
},
{
  "id": 2,
  "name":"John",
  "tag":"y"
},
{
  "id": 3,
  "name":"Jane",
  "tag":"x"
}

I want to get the count of documents (unique on name) that has both tag = "x" and tag = "y"

Given the above data, the query should return 1, because only John has two documents exists that has the two required tags.

What I am able to do so far is a query that uses OR ( so either tag = "x" or tag = "y") which will return 2. For example:

"aggs": {
  "distict_count": {
    "filter": {
      "terms": {
        "tag": [
          "x",
          "y"
        ]
      }
    },
    "aggs": {
      "agg_cardinality_name": {
        "cardinality": {
          "field": "name"
        }
      }
    }
  }
}

Would it be possible to change that to use and instead of or ?

Answer 1

Try putting cardinality under a terms agg to get proper distinct counts:

{
  "size": 0,
  "aggs": {
    "distict_count": {
      "filter": {
        "terms": {
          "tag": [
            "x",
            "y"
          ]
        }
      },
      "aggs": {
        "agg_terms": {
          "terms": {
            "field": "name"
          },
          "aggs": {
            "agg_cardinality_name": {
              "cardinality": {
                "field": "name"
              }
            }
          }
        }
      }
    }
  }
}

CORRECTION

You can use a combination of cardinality aggs with a bucket_selector which'll rule out buckets where there are fewer than 2 unique tags -- ie both x and y:

{
  "size": 0,
  "aggs": {
    "distict_count": {
      "filter": {
        "terms": {
          "tag": [
            "x",
            "y"
          ]
        }
      },
      "aggs": {
        "agg_terms": {
          "terms": {
            "field": "name"
          },
          "aggs": {
            "agg_cardinality_tag2": {
              "bucket_selector": {
                "buckets_path": {
                  "unique_tags_count": "unique_tags_count"
                },
                "script": "params.unique_tags_count > 1"
              }
            },
            "unique_tags_count": {
              "cardinality": {
                "field": "tag"
              }
            },
            "unique_names_count": {
              "cardinality": {
                "field": "name"
              }
            }
          }
        }
      }
    }
  }
}