Reproduction of faceting of has_child query

create-index.sh

#!/bin/sh

# assume the index products doesn't exist
# otherwise uncomment the following line
# curl -XDELETE localhost:9200/products

curl -XPUT localhost:9200/products/product/1 -d'{
  "property1": "value1"
}'

curl -XPUT localhost:9200/products/product/2 -d'{
  "property1": "value2"
}'

curl -XPOST localhost:9200/products/offer/_mapping -d '{
  "book":{
    "_parent": {"type": "product"}
  }
}'

curl -XPOST localhost:9200/products/offer/1?parent=1 -d '{
   "color": "blue",
   "size": 1
}'

curl -XPOST localhost:9200/products/offer/2?parent=1 -d '{
   "color": "red",
   "size": 2
}'

curl -XPOST localhost:9200/products/offer/3?parent=2 -d '{
   "color": "blue",
   "size": 3
}'

tests.sh

#!/bin/sh
curl -s -XPOST 'localhost:9200/products/_search?pretty=true' -d '{
    "query" : {
        "bool" : {
          "must" : [
            {
              "term" : { "property1" : "value1" }
            },
            {
              "has_child" : {
                "type" : "offer",
                "query" : {
                    "term" : {
                        "color" : "blue"        
                    }
                }
              }
            }
          ]
      }
    },
    "facets" : {
        "size" : {
            "terms" : {
                "field" : "size"
            },
            "global" : true,
            "facet_filter" : {
              "bool" : {
                "must" : [
                  { "term" : { "color" : "blue" } },
                  { "term" : { "property1" : "value1" } } 
                ]
              }
            }
        }
    }
}'