|
|
@@ -0,0 +1,435 @@ |
|
|
|
# spring-boot-demo-elasticsearch |
|
|
|
|
|
|
|
> 此 demo 主要演示了 Spring Boot 如何集成 `spring-boot-starter-data-elasticsearch` 完成对 ElasticSearch 的高级使用技巧,包括创建索引、配置映射、删除索引、增删改查基本操作、复杂查询、高级查询、聚合查询等。 |
|
|
|
|
|
|
|
## 注意 |
|
|
|
|
|
|
|
作者编写本demo时,ElasticSearch版本为 `6.5.3`,使用 docker 运行,下面是所有步骤: |
|
|
|
|
|
|
|
1. 下载镜像:`docker pull elasticsearch:6.5.3` |
|
|
|
|
|
|
|
2. 运行容器:`docker run -d -p 9200:9200 -p 9300:9300 --name elasticsearch-6.5.3 elasticsearch:6.5.3` |
|
|
|
|
|
|
|
3. 进入容器:`docker exec -it elasticsearch-6.5.3 /bin/bash` |
|
|
|
|
|
|
|
4. 安装 ik 分词器:`./bin/elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/v6.5.3/elasticsearch-analysis-ik-6.5.3.zip` |
|
|
|
|
|
|
|
5. 修改 es 配置文件:`vi ./config/elasticsearch.yml |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
```yaml |
|
|
|
cluster.name: "docker-cluster" |
|
|
|
network.host: 0.0.0.0 |
|
|
|
|
|
|
|
# minimum_master_nodes need to be explicitly set when bound on a public IP |
|
|
|
# set to 1 to allow single node clusters |
|
|
|
# Details: https://github.com/elastic/elasticsearch/pull/17288 |
|
|
|
discovery.zen.minimum_master_nodes: 1 |
|
|
|
|
|
|
|
# just for elasticsearch-head plugin |
|
|
|
http.cors.enabled: true |
|
|
|
http.cors.allow-origin: "*" |
|
|
|
``` |
|
|
|
|
|
|
|
6. 退出容器:`exit` |
|
|
|
|
|
|
|
7. 停止容器:`docker stop elasticsearch-6.5.3` |
|
|
|
|
|
|
|
8. 启动容器:`docker start elasticsearch-6.5.3` |
|
|
|
|
|
|
|
## pom.xml |
|
|
|
|
|
|
|
```xml |
|
|
|
<?xml version="1.0" encoding="UTF-8"?> |
|
|
|
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
|
|
|
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> |
|
|
|
<modelVersion>4.0.0</modelVersion> |
|
|
|
|
|
|
|
<artifactId>spring-boot-demo-elasticsearch</artifactId> |
|
|
|
<version>1.0.0-SNAPSHOT</version> |
|
|
|
<packaging>jar</packaging> |
|
|
|
|
|
|
|
<name>spring-boot-demo-elasticsearch</name> |
|
|
|
<description>Demo project for Spring Boot</description> |
|
|
|
|
|
|
|
<parent> |
|
|
|
<groupId>com.xkcoding</groupId> |
|
|
|
<artifactId>spring-boot-demo</artifactId> |
|
|
|
<version>1.0.0-SNAPSHOT</version> |
|
|
|
</parent> |
|
|
|
|
|
|
|
<properties> |
|
|
|
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> |
|
|
|
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> |
|
|
|
<java.version>1.8</java.version> |
|
|
|
</properties> |
|
|
|
|
|
|
|
<dependencies> |
|
|
|
<dependency> |
|
|
|
<groupId>org.springframework.boot</groupId> |
|
|
|
<artifactId>spring-boot-starter</artifactId> |
|
|
|
</dependency> |
|
|
|
|
|
|
|
<dependency> |
|
|
|
<groupId>org.springframework.boot</groupId> |
|
|
|
<artifactId>spring-boot-starter-data-elasticsearch</artifactId> |
|
|
|
</dependency> |
|
|
|
|
|
|
|
<dependency> |
|
|
|
<groupId>org.springframework.boot</groupId> |
|
|
|
<artifactId>spring-boot-starter-test</artifactId> |
|
|
|
<scope>test</scope> |
|
|
|
</dependency> |
|
|
|
|
|
|
|
<dependency> |
|
|
|
<groupId>org.projectlombok</groupId> |
|
|
|
<artifactId>lombok</artifactId> |
|
|
|
<optional>true</optional> |
|
|
|
</dependency> |
|
|
|
|
|
|
|
<dependency> |
|
|
|
<groupId>cn.hutool</groupId> |
|
|
|
<artifactId>hutool-all</artifactId> |
|
|
|
</dependency> |
|
|
|
|
|
|
|
<dependency> |
|
|
|
<groupId>com.google.guava</groupId> |
|
|
|
<artifactId>guava</artifactId> |
|
|
|
</dependency> |
|
|
|
</dependencies> |
|
|
|
|
|
|
|
<build> |
|
|
|
<finalName>spring-boot-demo-elasticsearch</finalName> |
|
|
|
<plugins> |
|
|
|
<plugin> |
|
|
|
<groupId>org.springframework.boot</groupId> |
|
|
|
<artifactId>spring-boot-maven-plugin</artifactId> |
|
|
|
</plugin> |
|
|
|
</plugins> |
|
|
|
</build> |
|
|
|
|
|
|
|
</project> |
|
|
|
``` |
|
|
|
|
|
|
|
## Person.java |
|
|
|
|
|
|
|
> 实体类 |
|
|
|
> |
|
|
|
> @Document 注解主要声明索引名、类型名、分片数量和备份数量 |
|
|
|
> |
|
|
|
> @Field 注解主要声明字段对应ES的类型 |
|
|
|
|
|
|
|
```java |
|
|
|
/** |
|
|
|
* <p> |
|
|
|
* 用户实体类 |
|
|
|
* </p> |
|
|
|
* |
|
|
|
* @package: com.xkcoding.elasticsearch.model |
|
|
|
* @description: 用户实体类 |
|
|
|
* @author: yangkai.shen |
|
|
|
* @date: Created in 2018-12-20 17:29 |
|
|
|
* @copyright: Copyright (c) 2018 |
|
|
|
* @version: V1.0 |
|
|
|
* @modified: yangkai.shen |
|
|
|
*/ |
|
|
|
@Document(indexName = EsConsts.INDEX_NAME, type = EsConsts.TYPE_NAME, shards = 1, replicas = 0) |
|
|
|
@Data |
|
|
|
@NoArgsConstructor |
|
|
|
@AllArgsConstructor |
|
|
|
public class Person { |
|
|
|
/** |
|
|
|
* 主键 |
|
|
|
*/ |
|
|
|
@Id |
|
|
|
private Long id; |
|
|
|
|
|
|
|
/** |
|
|
|
* 名字 |
|
|
|
*/ |
|
|
|
@Field(type = FieldType.Keyword) |
|
|
|
private String name; |
|
|
|
|
|
|
|
/** |
|
|
|
* 国家 |
|
|
|
*/ |
|
|
|
@Field(type = FieldType.Keyword) |
|
|
|
private String country; |
|
|
|
|
|
|
|
/** |
|
|
|
* 年龄 |
|
|
|
*/ |
|
|
|
@Field(type = FieldType.Integer) |
|
|
|
private Integer age; |
|
|
|
|
|
|
|
/** |
|
|
|
* 生日 |
|
|
|
*/ |
|
|
|
@Field(type = FieldType.Date) |
|
|
|
private Date birthday; |
|
|
|
|
|
|
|
/** |
|
|
|
* 介绍 |
|
|
|
*/ |
|
|
|
@Field(type = FieldType.Text, analyzer = "ik_smart") |
|
|
|
private String remark; |
|
|
|
} |
|
|
|
``` |
|
|
|
|
|
|
|
## PersonRepository.java |
|
|
|
|
|
|
|
```java |
|
|
|
/** |
|
|
|
* <p> |
|
|
|
* 用户持久层 |
|
|
|
* </p> |
|
|
|
* |
|
|
|
* @package: com.xkcoding.elasticsearch.repository |
|
|
|
* @description: 用户持久层 |
|
|
|
* @author: yangkai.shen |
|
|
|
* @date: Created in 2018-12-20 19:00 |
|
|
|
* @copyright: Copyright (c) 2018 |
|
|
|
* @version: V1.0 |
|
|
|
* @modified: yangkai.shen |
|
|
|
*/ |
|
|
|
public interface PersonRepository extends ElasticsearchRepository<Person, Long> { |
|
|
|
|
|
|
|
/** |
|
|
|
* 根据年龄区间查询 |
|
|
|
* |
|
|
|
* @param min 最小值 |
|
|
|
* @param max 最大值 |
|
|
|
* @return 满足条件的用户列表 |
|
|
|
*/ |
|
|
|
List<Person> findByAgeBetween(Integer min, Integer max); |
|
|
|
} |
|
|
|
``` |
|
|
|
|
|
|
|
## TemplateTest.java |
|
|
|
|
|
|
|
> 主要测试创建索引、映射配置、删除索引 |
|
|
|
|
|
|
|
```java |
|
|
|
/** |
|
|
|
* <p> |
|
|
|
* 测试 ElasticTemplate 的创建/删除 |
|
|
|
* </p> |
|
|
|
* |
|
|
|
* @package: com.xkcoding.elasticsearch.template |
|
|
|
* @description: 测试 ElasticTemplate 的创建/删除 |
|
|
|
* @author: yangkai.shen |
|
|
|
* @date: Created in 2018-12-20 17:46 |
|
|
|
* @copyright: Copyright (c) 2018 |
|
|
|
* @version: V1.0 |
|
|
|
* @modified: yangkai.shen |
|
|
|
*/ |
|
|
|
public class TemplateTest extends SpringBootDemoElasticsearchApplicationTests { |
|
|
|
@Autowired |
|
|
|
private ElasticsearchTemplate esTemplate; |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试 ElasticTemplate 创建 index |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void testCreateIndex() { |
|
|
|
// 创建索引,会根据Item类的@Document注解信息来创建 |
|
|
|
esTemplate.createIndex(Person.class); |
|
|
|
|
|
|
|
// 配置映射,会根据Item类中的id、Field等字段来自动完成映射 |
|
|
|
esTemplate.putMapping(Person.class); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试 ElasticTemplate 删除 index |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void testDeleteIndex() { |
|
|
|
esTemplate.deleteIndex(Person.class); |
|
|
|
} |
|
|
|
} |
|
|
|
``` |
|
|
|
|
|
|
|
## PersonRepositoryTest.java |
|
|
|
|
|
|
|
> 主要功能,参见方法上方注释 |
|
|
|
|
|
|
|
```java |
|
|
|
/** |
|
|
|
* <p> |
|
|
|
* 测试 Repository 操作ES |
|
|
|
* </p> |
|
|
|
* |
|
|
|
* @package: com.xkcoding.elasticsearch.repository |
|
|
|
* @description: 测试 Repository 操作ES |
|
|
|
* @author: yangkai.shen |
|
|
|
* @date: Created in 2018-12-20 19:03 |
|
|
|
* @copyright: Copyright (c) 2018 |
|
|
|
* @version: V1.0 |
|
|
|
* @modified: yangkai.shen |
|
|
|
*/ |
|
|
|
@Slf4j |
|
|
|
public class PersonRepositoryTest extends SpringBootDemoElasticsearchApplicationTests { |
|
|
|
@Autowired |
|
|
|
private PersonRepository repo; |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试新增 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void save() { |
|
|
|
Person person = new Person(1L, "刘备", "蜀国", 18, DateUtil.parse("1990-01-02 03:04:05"), "刘备(161年-223年6月10日),即汉昭烈帝(221年-223年在位),又称先主,字玄德,东汉末年幽州涿郡涿县(今河北省涿州市)人,西汉中山靖王刘胜之后,三国时期蜀汉开国皇帝、政治家。\n刘备少年时拜卢植为师;早年颠沛流离,备尝艰辛,投靠过多个诸侯,曾参与镇压黄巾起义。先后率军救援北海相孔融、徐州牧陶谦等。陶谦病亡后,将徐州让与刘备。赤壁之战时,刘备与孙权联盟击败曹操,趁势夺取荆州。而后进取益州。于章武元年(221年)在成都称帝,国号汉,史称蜀或蜀汉。《三国志》评刘备的机权干略不及曹操,但其弘毅宽厚,知人待士,百折不挠,终成帝业。刘备也称自己做事“每与操反,事乃成尔”。\n章武三年(223年),刘备病逝于白帝城,终年六十三岁,谥号昭烈皇帝,庙号烈祖,葬惠陵。后世有众多文艺作品以其为主角,在成都武侯祠有昭烈庙为纪念。"); |
|
|
|
Person save = repo.save(person); |
|
|
|
log.info("【save】= {}", save); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试批量新增 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void saveList() { |
|
|
|
List<Person> personList = Lists.newArrayList(); |
|
|
|
personList.add(new Person(2L, "曹操", "魏国", 20, DateUtil.parse("1988-01-02 03:04:05"), "曹操(155年-220年3月15日),字孟德,一名吉利,小字阿瞒,沛国谯县(今安徽亳州)人。东汉末年杰出的政治家、军事家、文学家、书法家,三国中曹魏政权的奠基人。\n曹操曾担任东汉丞相,后加封魏王,奠定了曹魏立国的基础。去世后谥号为武王。其子曹丕称帝后,追尊为武皇帝,庙号太祖。\n东汉末年,天下大乱,曹操以汉天子的名义征讨四方,对内消灭二袁、吕布、刘表、马超、韩遂等割据势力,对外降服南匈奴、乌桓、鲜卑等,统一了中国北方,并实行一系列政策恢复经济生产和社会秩序,扩大屯田、兴修水利、奖励农桑、重视手工业、安置流亡人口、实行“租调制”,从而使中原社会渐趋稳定、经济出现转机。黄河流域在曹操统治下,政治渐见清明,经济逐步恢复,阶级压迫稍有减轻,社会风气有所好转。曹操在汉朝的名义下所采取的一些措施具有积极作用。\n曹操军事上精通兵法,重贤爱才,为此不惜一切代价将看中的潜能分子收于麾下;生活上善诗歌,抒发自己的政治抱负,并反映汉末人民的苦难生活,气魄雄伟,慷慨悲凉;散文亦清峻整洁,开启并繁荣了建安文学,给后人留下了宝贵的精神财富,鲁迅评价其为“改造文章的祖师”。同时曹操也擅长书法,唐朝张怀瓘在《书断》将曹操的章草评为“妙品”。")); |
|
|
|
personList.add(new Person(3L, "孙权", "吴国", 19, DateUtil.parse("1989-01-02 03:04:05"), "孙权(182年-252年5月21日),字仲谋,吴郡富春(今浙江杭州富阳区)人。三国时代孙吴的建立者(229年-252年在位)。\n孙权的父亲孙坚和兄长孙策,在东汉末年群雄割据中打下了江东基业。建安五年(200年),孙策遇刺身亡,孙权继之掌事,成为一方诸侯。建安十三年(208年),与刘备建立孙刘联盟,并于赤壁之战中击败曹操,奠定三国鼎立的基础。建安二十四年(219年),孙权派吕蒙成功袭取刘备的荆州,使领土面积大大增加。\n黄武元年(222年),孙权被魏文帝曹丕册封为吴王,建立吴国。同年,在夷陵之战中大败刘备。黄龙元年(229年),在武昌正式称帝,国号吴,不久后迁都建业。孙权称帝后,设置农官,实行屯田,设置郡县,并继续剿抚山越,促进了江南经济的发展。在此基础上,他又多次派人出海。黄龙二年(230年),孙权派卫温、诸葛直抵达夷州。\n孙权晚年在继承人问题上反复无常,引致群下党争,朝局不稳。太元元年(252年)病逝,享年七十一岁,在位二十四年,谥号大皇帝,庙号太祖,葬于蒋陵。\n孙权亦善书,唐代张怀瓘在《书估》中将其书法列为第三等。")); |
|
|
|
personList.add(new Person(4L, "诸葛亮", "蜀国", 16, DateUtil.parse("1992-01-02 03:04:05"), "诸葛亮(181年-234年10月8日),字孔明,号卧龙,徐州琅琊阳都(今山东临沂市沂南县)人,三国时期蜀国丞相,杰出的政治家、军事家、外交家、文学家、书法家、发明家。\n早年随叔父诸葛玄到荆州,诸葛玄死后,诸葛亮就在襄阳隆中隐居。后刘备三顾茅庐请出诸葛亮,联孙抗曹,于赤壁之战大败曹军。形成三国鼎足之势,又夺占荆州。建安十六年(211年),攻取益州。继又击败曹军,夺得汉中。蜀章武元年(221年),刘备在成都建立蜀汉政权,诸葛亮被任命为丞相,主持朝政。蜀后主刘禅继位,诸葛亮被封为武乡侯,领益州牧。勤勉谨慎,大小政事必亲自处理,赏罚严明;与东吴联盟,改善和西南各族的关系;实行屯田政策,加强战备。前后六次北伐中原,多以粮尽无功。终因积劳成疾,于蜀建兴十二年(234年)病逝于五丈原(今陕西宝鸡岐山境内),享年54岁。刘禅追封其为忠武侯,后世常以武侯尊称诸葛亮。东晋政权因其军事才能特追封他为武兴王。\n诸葛亮散文代表作有《出师表》《诫子书》等。曾发明木牛流马、孔明灯等,并改造连弩,叫做诸葛连弩,可一弩十矢俱发。诸葛亮一生“鞠躬尽瘁、死而后已”,是中国传统文化中忠臣与智者的代表人物。")); |
|
|
|
Iterable<Person> people = repo.saveAll(personList); |
|
|
|
log.info("【people】= {}", people); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试更新 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void update() { |
|
|
|
repo.findById(1L).ifPresent(person -> { |
|
|
|
person.setRemark(person.getRemark() + "\n更新更新更新更新更新"); |
|
|
|
Person save = repo.save(person); |
|
|
|
log.info("【save】= {}", save); |
|
|
|
}); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试删除 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void delete() { |
|
|
|
// 主键删除 |
|
|
|
repo.deleteById(1L); |
|
|
|
|
|
|
|
// 对象删除 |
|
|
|
repo.findById(2L).ifPresent(person -> repo.delete(person)); |
|
|
|
|
|
|
|
// 批量删除 |
|
|
|
repo.deleteAll(repo.findAll()); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试普通查询,按生日倒序 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void select() { |
|
|
|
repo.findAll(Sort.by(Sort.Direction.DESC, "birthday")) |
|
|
|
.forEach(person -> log.info("{} 生日: {}", person.getName(), DateUtil.formatDateTime(person.getBirthday()))); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 自定义查询,根据年龄范围查询 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void customSelectRangeOfAge() { |
|
|
|
repo.findByAgeBetween(18, 19).forEach(person -> log.info("{} 年龄: {}", person.getName(), person.getAge())); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 高级查询 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void advanceSelect() { |
|
|
|
// QueryBuilders 提供了很多静态方法,可以实现大部分查询条件的封装 |
|
|
|
MatchQueryBuilder queryBuilder = QueryBuilders.matchQuery("name", "孙权"); |
|
|
|
log.info("【queryBuilder】= {}", queryBuilder.toString()); |
|
|
|
|
|
|
|
repo.search(queryBuilder).forEach(person -> log.info("【person】= {}", person)); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 自定义高级查询 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void customAdvanceSelect() { |
|
|
|
// 构造查询条件 |
|
|
|
NativeSearchQueryBuilder queryBuilder = new NativeSearchQueryBuilder(); |
|
|
|
// 添加基本的分词条件 |
|
|
|
queryBuilder.withQuery(QueryBuilders.matchQuery("remark", "东汉")); |
|
|
|
// 排序条件 |
|
|
|
queryBuilder.withSort(SortBuilders.fieldSort("age").order(SortOrder.DESC)); |
|
|
|
// 分页条件 |
|
|
|
queryBuilder.withPageable(PageRequest.of(0, 2)); |
|
|
|
Page<Person> people = repo.search(queryBuilder.build()); |
|
|
|
log.info("【people】总条数 = {}", people.getTotalElements()); |
|
|
|
log.info("【people】总页数 = {}", people.getTotalPages()); |
|
|
|
people.forEach(person -> log.info("【person】= {},年龄 = {}", person.getName(), person.getAge())); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试聚合,测试平均年龄 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void agg() { |
|
|
|
// 构造查询条件 |
|
|
|
NativeSearchQueryBuilder queryBuilder = new NativeSearchQueryBuilder(); |
|
|
|
// 不查询任何结果 |
|
|
|
queryBuilder.withSourceFilter(new FetchSourceFilter(new String[]{""}, null)); |
|
|
|
|
|
|
|
// 平均年龄 |
|
|
|
queryBuilder.addAggregation(AggregationBuilders.avg("avg").field("age")); |
|
|
|
|
|
|
|
log.info("【queryBuilder】= {}", JSONUtil.toJsonStr(queryBuilder.build())); |
|
|
|
|
|
|
|
AggregatedPage<Person> people = (AggregatedPage<Person>) repo.search(queryBuilder.build()); |
|
|
|
double avgAge = ((InternalAvg) people.getAggregation("avg")).getValue(); |
|
|
|
log.info("【avgAge】= {}", avgAge); |
|
|
|
} |
|
|
|
|
|
|
|
/** |
|
|
|
* 测试高级聚合查询,每个国家的人有几个,每个国家的平均年龄是多少 |
|
|
|
*/ |
|
|
|
@Test |
|
|
|
public void advanceAgg() { |
|
|
|
// 构造查询条件 |
|
|
|
NativeSearchQueryBuilder queryBuilder = new NativeSearchQueryBuilder(); |
|
|
|
// 不查询任何结果 |
|
|
|
queryBuilder.withSourceFilter(new FetchSourceFilter(new String[]{""}, null)); |
|
|
|
|
|
|
|
// 1. 添加一个新的聚合,聚合类型为terms,聚合名称为country,聚合字段为age |
|
|
|
queryBuilder.addAggregation(AggregationBuilders.terms("country").field("country") |
|
|
|
// 2. 在国家聚合桶内进行嵌套聚合,求平均年龄 |
|
|
|
.subAggregation(AggregationBuilders.avg("avg").field("age"))); |
|
|
|
|
|
|
|
log.info("【queryBuilder】= {}", JSONUtil.toJsonStr(queryBuilder.build())); |
|
|
|
|
|
|
|
// 3. 查询 |
|
|
|
AggregatedPage<Person> people = (AggregatedPage<Person>) repo.search(queryBuilder.build()); |
|
|
|
|
|
|
|
// 4. 解析 |
|
|
|
// 4.1. 从结果中取出名为 country 的那个聚合,因为是利用String类型字段来进行的term聚合,所以结果要强转为StringTerm类型 |
|
|
|
StringTerms country = (StringTerms) people.getAggregation("country"); |
|
|
|
// 4.2. 获取桶 |
|
|
|
List<StringTerms.Bucket> buckets = country.getBuckets(); |
|
|
|
for (StringTerms.Bucket bucket : buckets) { |
|
|
|
// 4.3. 获取桶中的key,即国家名称 4.4. 获取桶中的文档数量 |
|
|
|
log.info("{} 总共有 {} 人", bucket.getKeyAsString(), bucket.getDocCount()); |
|
|
|
// 4.5. 获取子聚合结果: |
|
|
|
InternalAvg avg = (InternalAvg) bucket.getAggregations().asMap().get("avg"); |
|
|
|
log.info("平均年龄:{}", avg); |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
} |
|
|
|
``` |
|
|
|
|
|
|
|
## 参考 |
|
|
|
|
|
|
|
1. ElasticSearch 官方文档:https://www.elastic.co/guide/en/elasticsearch/reference/6.x/getting-started.html |
|
|
|
2. spring-data-elasticsearch 官方文档:https://docs.spring.io/spring-data/elasticsearch/docs/3.1.2.RELEASE/reference/html/ |
|
|
|
|