More like this (MLT) query to group/classify photos into albums

more_like_this.json

GET http://localhost:9200/development-asis-flickr_photos/_search
{
  "query": {
    "filtered": {
      "query": {
        "bool": {
          "must": [
            {
              "more_like_this": {
                "fields": [
                  "tags"
                ],
                "ids": [
                  "12345"
                ],
                "min_term_freq": 1,
                "max_query_terms": 500,
                "percent_terms_to_match": 0.75
              }
            },
            {
              "more_like_this": {
                "fields": [
                  "title"
                ],
                "ids": [
                  "12345"
                ],
                "min_term_freq": 1,
                "max_query_terms": 500,
                "percent_terms_to_match": 0.5
              }
            },
            {
              "more_like_this": {
                "fields": [
                  "description"
                ],
                "ids": [
                  "12345"
                ],
                "min_term_freq": 1,
                "max_query_terms": 500,
                "percent_terms_to_match": 0.8
              }
            }
          ]
        }
      },
      "filter": {
        "bool": {
          "must": [
            {
              "term": {
                "owner": "flickr_user_1@n02"
              }
            },
            {
              "term": {
                "taken_at": "2012-04-23"
              }
            }
          ]
        }
      }
    }
  },
  "aggregations": {
    "scores_histogram": {
      "histogram": {
        "script": "doc.score",
        "interval": 2,
        "order": {
          "_key": "desc"
        }
      }
    }
  }
}