Compute TF/IDF across indexes

gistfile1.sh

curl  -XPUT localhost:9200/index1/type/1 -d '{
  "title": "alice dance"
}'

curl  -XPUT localhost:9200/index1/type/2 -d '{
  "title": "alice jump"
}'

curl  -XPUT localhost:9200/index1/type/3 -d '{
  "title": "alice run"
}'

curl  -XPUT localhost:9200/index2/type/1 -d '{
  "title": "alice walk"
}'

curl  -XPUT localhost:9200/index2/type/2 -d '{
  "title": "marie jump"
}'

curl  -XPUT localhost:9200/index2/type/3 -d '{
  "title": "leslie run"
}'


POST /index1,index2/_search
{
    "query": {
        "query_string": {
           "default_field": "title",
           "query": "alice"
        }
    }
}

{"_index": "index2", "_type": "type", "_id": "1"}

{
    "_score": 0.8784157,
    "_source": {
        "title": "alice walks"
    },
    "_explanation": {
        "value": 0.8784157,
        "description": "weight(title:alice in 0) [PerFieldSimilarity], result of:",
        "details": [
            {
                "value": 0.8784157,
                "description": "fieldWeight in 0, product of:",
                "details": [
                    {
                        "value": 1,
                        "description": "tf(freq=1.0), with freq of:",
                        "details": [
                            {
                                "value": 1,
                                "description": "termFreq=1.0"
                            }
                        ]
                    },
                    {
                        "value": 1.4054651,
                        "description": "idf(docFreq=1, maxDocs=3)"
                    },
                    {
                        "value": 0.625,
                        "description": "fieldNorm(doc=0)"
                    }
                ]
            }
        ]
    }
}

{"_index": "index1", "_type": "type", "_id": "1"}

{
    "_score": 0.4451987,
    "_source": {
        "title": "alice dances"
    },
    "_explanation": {
        "value": 0.4451987,
        "description": "weight(title:alice in 0) [PerFieldSimilarity], result of:",
        "details": [
            {
                "value": 0.4451987,
                "description": "fieldWeight in 0, product of:",
                "details": [
                    {
                        "value": 1,
                        "description": "tf(freq=1.0), with freq of:",
                        "details": [
                            {
                                "value": 1,
                                "description": "termFreq=1.0"
                            }
                        ]
                    },
                    {
                        "value": 0.71231794,
                        "description": "idf(docFreq=3, maxDocs=3)"
                    },
                    {
                        "value": 0.625,
                        "description": "fieldNorm(doc=0)"
                    }
                ]
            }
        ]
    }
}