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elasticsearch api 调用

IT知识ElasticSearcelasticsearc

智慧并不产生于学历,而是来自对于知识的终生不懈的追求。这篇文章主要讲述elasticsearch api 调用相关的知识，希望能为你提供帮助。
elasticsearch


文章目录

  • ??elasticsearch??
  • ??说明??
  • ??下载安装 elasticsearch??
  • ??依赖??
  • ??初始化 es 客户端??
  • ??创建索引??
  • ??查看索引??
  • ??删除索引??
  • ??创建文档??
  • ??通过id查看文档??
  • ??修改文档??
  • ??通过id删除文档??
  • ??条件查询??
  • ??分页查询??
  • ??查询过滤字段??
  • ??条件查询??
  • ??聚合查询??

说明请先看理论知识, 再看代码, 事半功倍! 有些代码的测试数据可能不全, 旨在理解API的调用, 所以…
下载安装 elasticsearch【elasticsearch api 调用】这里下载安装的版本是 elasticsearch-7.8.0
依赖
< dependencies>
< dependency>
< groupId> org.elasticsearch< /groupId>
< artifactId> elasticsearch< /artifactId>
< version> 7.8.0< /version>
< /dependency>
< !-- elasticsearch 的客户端 -->
< dependency>
< groupId> org.elasticsearch.client< /groupId>
< artifactId> elasticsearch-rest-high-level-client< /artifactId>
< version> 7.8.0< /version>
< /dependency>

< !-- elasticsearch 依赖 2.x 的 log4j -->
< dependency>
< groupId> org.apache.logging.log4j< /groupId>
< artifactId> log4j-api< /artifactId>
< version> 2.8.2< /version>
< /dependency>
< dependency>
< groupId> org.apache.logging.log4j< /groupId>
< artifactId> log4j-core< /artifactId>
< version> 2.8.2< /version>
< /dependency>
< !-- junit 单元测试 -->
< dependency>
< groupId> junit< /groupId>
< artifactId> junit< /artifactId>
< version> 4.12< /version>
< /dependency>
< !-- 一个小而全的java工具类库(推荐使用) -->
< dependency>
< groupId> cn.hutool< /groupId>
< artifactId> hutool-all< /artifactId>
< version> 5.8.3< /version>
< /dependency>
< /dependencies>

初始化 es 客户端
@Test
public void initESClient() throws IOException
//创建 es 客户端
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost", 9200, "http"))
);
//业务代码区 -- begin
//TODO
//业务代码区 -- end
//关闭 es 客户端
esClient.close();

创建索引
@Test
public void createIndex() throws IOException
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost", 9200, "http"))
);
//使用 CreateIndexRequest 创建 user 索引
CreateIndexRequest request = new CreateIndexRequest("user");
CreateIndexResponse response = esClient.indices().create(request, RequestOptions.DEFAULT);
boolean acknowledged = response.isAcknowledged();
System.out.println("索引创建" + (acknowledged?"成功!":"失败!"));
esClient.close();

查看索引
@Test
public void getIndex() throws IOException
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost", 9200, "http"))
);
//查看 user 索引
GetIndexRequest request = new GetIndexRequest("user");
GetIndexResponse response = esClient.indices().get(request, RequestOptions.DEFAULT);
System.out.println("aliases: " + response.getAliases());
System.out.println("mappings: " + response.getMappings());
System.out.println("settings: " + response.getSettings());
esClient.close();

删除索引
@Test
public void delete() throws IOException
RestHighLevelClient esClient = new RestHighLevelClient(
RestClient.builder(new HttpHost("localhost", 9200, "http"))
);
DeleteIndexRequest request = new DeleteIndexRequest("car");
AcknowledgedResponse response = esClient.indices().delete(request, RequestOptions.DEFAULT);
boolean acknowledged = response.isAcknowledged();
System.

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