ElasticSearch Java Boost on Date [英] ElasticSearch Java Boost on Date

问题描述

我目前正在加强网址，标题和描述，如下所示：

I am currently boosting on url, title, and description as follows:

QueryBuilder qb = QueryBuilders.multiMatchQuery(term,"title", "description","url").field("title", 1.75f).field("url", 1.55f).field("description", 1.35f);

我想进一步添加提升到最近创建的文档（我有一个postDate字段映射为日期）。

I would like to further add boosting to documents created more recently (I have a postDate field mapped as date).

我发现这个 SO Post 指向遗产ES文档，指的是高斯衰变。然而，我似乎在目前的Java Api doc 。

I found this SO Post pointing to a legacy ES Doc which refers to gaussian decay. However, I cannot seem to find this in the current Java Api doc.

如何在最近创建（postDate）文档的QueryBuilder中添加一个提升？

How would I add a boost to my QueryBuilder for more recently created (postDate) documents?

推荐答案

你应该看看功能分数查询：
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-function -score-query.html

You should have a look at the function score query: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html

以下代码提供了您可以使用的内容：

The following code gives a hint to what you could use:

QueryBuilder qb = QueryBuilders.multiMatchQuery(term,"title", "description","url").field("title", 1.75f).field("url", 1.55f).field("description", 1.35f);
FunctionScoreQueryBuilder builder = QueryBuilders.functionScoreQuery(qb);
builder.add(ScoreFunctionBuilders.exponentialDecayFunction("postDate","14d"));

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