[ElasticSearch] Using facets when querying parent/child documents

gistfile1.sh

# Create an index:
#
curl -XDELETE 'http://127.0.0.1:9200/articles'
curl -XPUT 'http://127.0.0.1:9200/articles'

# Insert the action mapping, as a child of articles:
#
curl -XPUT 'http://127.0.0.1:9200/articles/action/_mapping' -d '
{
  "action": {
    "_parent": {
      "type": "article"
    },
    "properties": {
      "action": {
        "store": true,
        "type" : "string"
      },
      "date": {
        "store": true,
        "type" : "date"
      }
    }
  }
}
'

# Insert some articles:
#
curl -XPUT 'http://127.0.0.1:9200/articles/article/1' -d '{"title": "One"}'
curl -XPUT 'http://127.0.0.1:9200/articles/article/2' -d '{"title": "Two"}'

# Insert some actions that happened to those articles:
#
curl -XPOST 'http://127.0.0.1:9200/articles/action?parent=1' -d '{"date": "2011-11-18", "action": "created"}'
curl -XPOST 'http://127.0.0.1:9200/articles/action?parent=2' -d '{"date": "2011-11-18", "action": "created"}'
curl -XPOST 'http://127.0.0.1:9200/articles/action?parent=2' -d '{"date": "2011-11-23", "action": "published"}'

# Ensure the index is up-to-date:
#
curl -XPOST 'http://127.0.0.1:9200/articles/_refresh'

# Now search for all articles that contain 'One' in the title, and have actions that took place
# between 15th and 30th of November. Create facets for those actions:
#
curl -XGET 'http://127.0.0.1:9200/articles/_search' -d '
{
  "query": {
    "bool": {
      "must": [
        {
          "text": {
            "title": {
              "query": "One",
              "type": "boolean"
            }
          }
        },
        {
          "has_child": {
            "query": {
              "range": {
                "date": {
                  "to": "2011-11-30",
                  "from": "2011-11-15"
                }
              }
            },
            "type": "action",
            "_scope": "actions"
          }
        }
      ]
    }
  },
  "facets": {
    "created_facet": {
      "date_histogram": {
        "interval": "day",
        "params": {
          "param1": "created"
        },
        "key_field": "date",
        "value_script": "doc[\"action\"].value == param1 ? 1 : 0"
      },
      "scope": "actions"
    },
    "published_facet": {
      "date_histogram": {
        "interval": "day",
        "params": {
          "param1": "published"
        },
        "key_field": "date",
        "value_script": "doc[\"action\"].value == param1 ? 1 : 0"
      },
      "scope": "actions"
    }
  },
  "from": 0,
  "size": 10
}
'