この例だと13行目でorderにtop_hitを指定して、downlaod_count(数値のmax)でソートしてるけど、title.raw(※やりたかったのはgroup_name.rawでした)のようにタイトル(文字列)順でソートしたい...。例では、gidでグルーピングし、グループ毎に新しい順(released_at)で上位1件取得。
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August 29, 2015 14:04
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ElasticsearchでField Collapsing/Combining http://qiita.com/shoito/items/e56aba6c76f27e16167b
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| { | |
| "size": 0, | |
| "query": { | |
| "match": { | |
| "title": "ほげ" | |
| } | |
| }, | |
| "aggs": { | |
| "hits": { | |
| "terms": { | |
| "field": "gid", | |
| "order": { | |
| "top_hit": "desc" | |
| } | |
| }, | |
| "aggs": { | |
| "top": { | |
| "top_hits": { | |
| "sort": [ | |
| { | |
| "released_at": { | |
| "order": "desc" | |
| } | |
| } | |
| ], | |
| "size": 1 | |
| } | |
| }, | |
| "top_hit": { | |
| "max": { | |
| "field": "downlaod_count" | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } |
事前にソート用かaggs用にそのデータを入れておくと幸せかもですね。
良さそうな手を思いつかなくて。。。
おぉー、ありがとうございます。
確かに事前にソート兼aggs用のフィールドを作っておくのがベターな気がしますね。
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johtaniさんのヒントにscriptを使ってみたけど、こうかな！？
パフォーマンス的にどうなんだろう...