Elasticsearch:如何搜索，排序，限制结果然后再次排序? [英] Elasticsearch: How to search, sort, limit the results then sort again?

问题描述

这与多级排序无关.

我需要先根据距离选择结果，将其限制为50，然后再按价格对这50个结果进行排序.

I need my results first selected by distance, limited to 50, then those 50 sorted by price.

select * 
from
(
select top 50 * from mytable order by distance asc)
)
order by price asc

本质上，第二种排序放弃了内部排序的顺序-但是内部排序用于磨练前50个结果.

Essentially, the second sort throws away the ordering of the inner sort - but the inner sort is used to hone in on the top 50 results.

针对此类问题，我看到的其他答案是第二级排序，这不是我想要的.

The other answers I've seen for this sort of question looks at second-level sorting, which is not what I'm after.

顺便说一句:我看过汇总-前N个结果，但是我不确定我可以对汇总结果排序应用排序.还查看了 rescore ，但我不知道将排序"放在哪里

BTW: I've looked at aggregations - Top N results, but I'm not sure I can apply a sort on the aggregation result sort. Also looked at rescore, but I don't know where to put my 'sorts'

推荐答案

通过热门匹配，您可以根据主要查询的排序方式在单独的字段( price )上进行排序(在距离).在此处参阅文档，了解如何在排名靠前的agg中指定排序方式.

A top hits aggregation will allow you to sort on a separate field, in your case price from the main query sort (on distance). See the documentation here for how to specify sorting in the top hits agg.

它看起来有点像这样(假定 distance 是一种双精度型；如果是地理位置类型，请使用

It'll look a little like this (which assumes distance is a double type; if it's a geo-location type, use the documentation provided by Volodymyr Bilyachat.)

{
   "sort":[
      {
         "distance":"asc"
      }
   ],
   "query":{
      "match_all":{}
   },
   "size":50,
   "aggs":{
      "top_price_hits":{
         "top_hits":{
            "sort":[
               {
                  "price":{
                     "order":"asc"
                  }
               }
            ],
            "size":50
         }
      }
   }
}

但是，如果主要查询只需要50个结果，为什么不只在应用程序客户端排序呢?这将是一种更好的方法，因为将热门匹配用作次要排序是对其目的的轻微滥用.

However, if there are only 50 results that you want from your primary query, why don't you just sort in the application client side? This would be a better approach as using a top hits aggregation for a secondary sort is a slight abuse of its purpose.

应用程序内方法将更加健壮.

The in-application approach would be more robust.

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