Jest ElasticSearch Search API命中映射 [英] Jest ElasticSearch Search API Hits mapping

问题描述

我对弹性搜索非常陌生

我正在尝试理解以下代码:

I'm trying to understanding the below code :

List<Hit<Talk, Void>> hits = result.getHits(Talk.class);
        for (Hit<Talk, Void> hit: hits) {
            Talk talk = hit.source;
            log.info(talk.getTitle());
        }

这直接来自: https://www.elastic.co/blog/found-java-clients-for-elasticsearch

我的问题是，Java如何知道将哪个字段映射到什么变量.

My question is , how does Java know what field to map to what variable.

从本质上讲，Java如何知道将属性"title"与Talk类的成员变量"title"进行匹配.

Essentially , how does Java know , say to match the property "title" to the member variable "title" of the Talk class.

欢呼

推荐答案

在页面中，它提到 Talk 类是一个Bean.Bean实现 Serializable .调用 result.getHits 时，请注意如何将 Talk.class 对象传递到方法中.这意味着您基本上会将匹配内容反序列化为 Talk 实例.通过JEST Hit 类的结构，这就是从Elastisearch响应中反序列化 Talk 实例后如何访问它们的方式.

In the page it mentions that the Talk class is a Bean. Beans implement Serializable. When result.getHits is called, notice how Talk.class object is passed into the method. That means you are basically deserializing the hits into Talk instances. With how the JEST Hit class is structured, that is how you access the Talk instances after they are deserialized from the Elastisearch response.

有关Bean的更多信息，请参见此处:什么是JavaBean?

For more information on Beans, see here: What is a JavaBean exactly?

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