使用NEST Field Boosting进行弹性搜索 [英] Elastic Search using NEST Field Boosting
问题描述
我有一个包含条目的索引:
[ElasticType(Name =Entry,IdProperty =Id) ]
public class Entry
{
public string Id {get;组; }
public string标题{get;组; }
public string描述{get;组; }
public string Award {get;组; }
public int Year {get;组; }
}
哪里年份是入学年份,例如2012年,奖是获奖的类型获得,可以为null。
然后,我想使用boosting搜索这些条目,以获取不同的属性。在以下代码中,我希望结果在标题上的匹配排名高于描述符合的结果。
私有IQueryResponse<条目> 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))));
}
我现在被要求提升获奖者,并且还会提升新的条目(即按年度)。
我该怎么做?是否需要作为索引服务的一部分或作为搜索的一部分?
您可以实现这通过提升
查询和 custom_score
查询
而不是提升年份,因为:
(_ score + 2013)> (_score + 1999)
较新的结果将浮动到顶部。
通过使用提升查询,我们可以有效地降低缺少奖励字段的结果。
请参阅:
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
。过滤(nfq => nfq
.Query(qq => qq.MatchAll() )
.Filter(f => f.Missing(p => p.Award))
)
)
.NegativeBoost(0.2)
)
)
);
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; }
}
Where Year is the year of the entry, eg 2012, and Award is the type of Award the Entry won, which can be null.
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))));
}
I have now been asked to Boost the results by those which have won Awards, and also Boost newer Entries (ie by the Year).
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?
You can achieve this through a combination of a boosting
query and custom_score
query
instead of boosting year we alter the score based on the year because:
(_score + 2013) > (_score + 1999)
Newer results will float to the top.
By using a boosting query we can effectively demote results that are missing the award field.
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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