Elasticsearchを使ってレコメンデーションする ref: http://qiita.com/hadashiA/items/9a418df95f8611c041a2

file0.txt

$ plugin --url 'https://github.com/f-kubotar/elasticsearch-flavor/releases/download/v0.0.2/elasticsearch-flavor-0.0.3.zip' --install flavor

file1.txt

curl -XPOST localhost:9200/my_index -d '{
    "mappings" : {
        "preference" : {
            "preference": {
                "properties": {
                    "user_id": {
                        "type": "long"
                    },
                    "item_id": {
                        "type": "long"
                    },
                    "value": {
                        "type": "float"
                    }
                }
            }
        }
    }
}'

file2.txt

curl -XPOST 'localhost:9200/my_index/preference/1:101/_update' -d '{
    "script" : "ctx._source.value += value",
    "params" : {
        "user_id" : 1,
        "item_id": 101,
        "value": 1
    }
}'

file3.txt

$ curl 'localhost:9200/my_index/preference/_flavor/similar_items/5803?size=3&similarity=EuclideanDistanceSimilarity'
HTTP/1.1 200 OK
Content-Length: 126
Content-Type: application/json; charset=UTF-8

{
    "hits": {
        "hits": [
            {
                "item_id": 40891,
                "value": 1.0
            },
            {
                "item_id": 48541,
                "value": 1.0
            },
            {
                "item_id": 151,
                "value": 1.0
            }
        ],
        "total": 3
    },
    "took": 4
}