使用NEST现场推进弹性搜索 [英] Elastic Search using NEST Field Boosting

问题描述

我使用弹性搜索在C＃中使用强类型的客户端窝。
我有一个包含条目索引：

I am using Elastic Search in C# using the NEST strongly typed client. I have an index containing Entries:

[ElasticType(Name = "Entry", IdProperty = "Id")]
public class Entry
{
    public string Id { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public string Award { get; set; }
    public int Year { get; set; }
}

其中年是进入的年份，如2012年，和奖是奖项的类型赢了，它可以为null。

Where Year is the year of the entry, eg 2012, and Award is the type of Award the Entry won, which can be null.

然后我要搜索使用提升不同属性的这些条目。在下面的代码，我想结果进行排列的标题较高的那场比赛，比匹配的说明这一点。

I then want to search these Entries using boosting for different properties. In the following code, I want results to be ranked higher that match on the Title, than those that match on the Description.

private IQueryResponse<Entry> GetMatchedEntries(string searchText)
{
    return _elasticClient.Search<Entry>(
                body =>
                body.Query(q => 
                           q.QueryString(qs => 
                                         qs.OnFieldsWithBoost(d => 
                                                              d.Add(entry => entry.Title, 5.0)
                                                              .Add(entry => entry.Description, 2.0))
                           .Query(searchText))));
}

我现在已经被要求，以提高那些已经赢得大奖的结果，并且也助推新条目（由年度IE）。

I have now been asked to Boost the results by those which have won Awards, and also Boost newer Entries (ie by the Year).

我如何做到这一点？有什么事情需要做作为索引服务的一部分，或作为搜索的一部分？

How do I do this? Is it something that needs to be done as part of the indexing service, or as part of the search?

推荐答案

您可以实现这通过提高查询和 custom_score 查询

You can achieve this through a combination of a boosting query and custom_score query

而不是助推今年我们改变基础上，今年的分数，因为：

instead of boosting year we alter the score based on the year because:

(_score + 2013) > (_score + 1999)

较新的结果会浮到上面。

Newer results will float to the top.

通过使用升压查询，我们可以有效地降级缺少奖域结果

By using a boosting query we can effectively demote results that are missing the award field.

看到：$。 b $ b http://www.elasticsearch.org/guide/reference/query-dsl /boosting-query.html
http://www.elasticsearch.org/guide/reference/query-dsl/custom-score-query.html

see: http://www.elasticsearch.org/guide/reference/query-dsl/boosting-query.html http://www.elasticsearch.org/guide/reference/query-dsl/custom-score-query.html

_client.Search<Entry>(s=>s
    .Query(q =>q
        .Boosting(bq=>bq
            .Positive(pq=>pq
                .CustomScore(cbf=>cbf
                    .Query(cbfq=>cbfq
                        .QueryString(qs => qs
                            .OnFieldsWithBoost(d =>
                                d.Add(entry => entry.Title, 5.0)
                                .Add(entry => entry.Description, 2.0)
                            )
                            .Query(searchText)
                        )
                    )
                    .Script("_score + doc['year'].value")
                )
            )
            .Negative(nq=>nq
                .Filtered(nfq=>nfq
                    .Query(qq=>qq.MatchAll())
                    .Filter(f=>f.Missing(p=>p.Award))
                )
            )
            .NegativeBoost(0.2)
        )
    )
);

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