Elasticsearch Multi-Layered Nested Object: Accessing multiple Nested Layers in a Facet Does not work

gistfile1.rb

curl -XDELETE 'http://localhost:9200/tester
curl -XPUT 'http://localhost:9200/tester' -d '{}'
curl -XPUT 'http://localhost:9200/tester/test/_mapping' -d '{
    "authors": {
        "properties": {
            "name": {"type": "string"},
            "keywords": {
                "type": "nested", 
                "properties": {
                    "words": {"type": "string", "index" : "not_analyzed"},
                    "records": {
                        "type": "nested", "index": "not_analyzed",
                        "properties": {
                            "name": {"type": "string", "index": "not_analyzed"},
                            "count":  {"type": "integer", "index": "not_analyzed"}
                        }
                    }
                }
            }
        }
    }
}' && echo

curl -XPUT 'http://localhost:9200/tester/test/1' -d '{
  "name": "searchterm banana",
	"keywords": [
		{
		    "words": "The Grapes of Wrath",
		    "records": [
		        {"name": "weight1", "count": 16},
		        {"name": "weight2", "count": 54}
        	    ]
        	}
	]
}' && echo
curl -XPUT 'http://localhost:9200/tester/test/1' -d '{
  "name": "searchterm banana second",
  "keywords": [
		{
		    "words": "The Grapes of Wrath text is fun",
		    "records": [
		        {"name": "weight3", "count": 6},
		        {"name": "weight6", "count": 5}
        	    ]
        	}
	]
}' && echo

curl -XPOST 'http://localhost:9200/tester/_refresh' && echo

#Search Will get facet results, but the total will always be null
curl -s 'http://localhost:9200/tester/test/_search?pretty=true '{"query":{
  "nested":
    {"query":
      {"filtered":
        {"query":
          {"match_all":
            {}
          }
        }
       },
       "path":"keywords"
     }
   },
   "facets":{
      "install_stat":{
          "nested":"keywords",
          "terms_stats":
            {"key_field":"keywords.words",
              "_script":
                {"value_script":"sum(doc['keywords.records.count'].values)",
                  "lang":"python",
                  "order":"count",
                  "size":3,
                  "nested":"keywords.records"
                },
            }
        }
    },"size":3
  }' && echo
  
  #Search Will not get any facet results
curl -s 'http://localhost:9200/tester/test/_search?pretty=true '{"query":{
  "nested":
    {"query":
      {"filtered":
        {"query":
          {"match_all":
            {}
          }
        }
       },
       "path":"keywords"
     }
   },
   "facets":{
      "install_stat":{
          "nested":"keywords.records",
          "terms_stats":
            {"key_field":"keywords.words",
              "_script":
                {"value_script":"sum(doc['keywords.records.count'].values)",
                  "lang":"python",
                  "order":"count",
                  "size":3,
                  "nested":"keywords.records"
                },
            }
        }
    },"size":3
  }' && echo