Elasticsearch升级到7.16之后，已经废弃了High-level API了，统一使用Low-Level API，所以某些接口发生了变化，下面将会列出Elasticsearch Low-Level API的一些基本操作。
maven依赖：测试用的Entity：4.0.0 org.springframework.boot spring-boot-starter-parent2.6.3 ljxwtl.cn SpringBoot0.0.1-SNAPSHOT SpringBoot SpringBoot 1.8 org.springframework.boot spring-boot-starter-weborg.springframework.boot spring-boot-starter-tomcatorg.springframework.boot spring-boot-starter-undertoworg.projectlombok lomboktrue co.elastic.clients elasticsearch-java7.17.0 jakarta.json jakarta.json-api2.0.1 org.springframework.boot spring-boot-starter-testtest junit junit4.13.2 test com.alibaba fastjson1.2.79 org.springframework.boot spring-boot-maven-pluginorg.projectlombok lombok
package ljxwtl.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Person {
private String id;
private String nickname;
private String name;
private Integer age;
private Boolean sex;
}
这里建议使用基本类型的包装类，因为基本类型是有默认值的，所以会影响更新结果。
测试类：
package ljxwtl;
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch._types.mapping.*;
import co.elastic.clients.elasticsearch.core.*;
import co.elastic.clients.elasticsearch.core.search.Hit;
import co.elastic.clients.elasticsearch.indices.*;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import com.alibaba.fastjson.JSON;
import ljxwtl.entity.Person;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.client.RestClient;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.io.IOException;
import java.util.*;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = SpringBootApplicationMain.class)
public class ApplicationTests {
private ElasticsearchClient elasticsearchClient;
@Before
public void before(){
RestClient restClient = RestClient.builder(
new HttpHost("ljxwtl.cn", 9200)
)
.setHttpClientConfigCallback(httpAsyncClientBuilder->{
//账密设置
CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
//es账号密码（一般使用,用户elastic）
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("elastic", "123456"));
httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
return httpAsyncClientBuilder;
}).build();
RestClientTransport restClientTransport = new RestClientTransport(restClient, new JacksonJsonpMapper());
elasticsearchClient = new ElasticsearchClient(restClientTransport);
}
@Test
public void createIndex() throws IOException {
String indexName = "es_index_name";
String aliasIndexName = "es_alias_index_name";
Map propertyMap = new HashMap<>();
propertyMap.put("name",new Property(new TextProperty.Builder().index(true).store(true).build()));
propertyMap.put("age",new Property(new IntegerNumberProperty.Builder().index(false).build()));
propertyMap.put("sex",new Property(new BooleanProperty.Builder().index(false).build()));
TypeMapping typeMapping = new TypeMapping.Builder().properties(propertyMap).build();
IndexSettings indexSettings = new IndexSettings.Builder().numberOfShards(String.valueOf(1)).numberOfReplicas(String.valueOf(0)).build();
CreateIndexRequest createIndexRequest = new CreateIndexRequest.Builder()
.index(indexName)
.aliases(aliasIndexName, new Alias.Builder().isWriteIndex(true).build())
.mappings(typeMapping)
.settings(indexSettings)
.build();
CreateIndexResponse createIndexResponse = elasticsearchClient.indices().create(createIndexRequest);
System.out.println(createIndexResponse.acknowledged());
}
@Test
public void getIndexWithMappingsAndSettings() throws IOException {
GetIndexRequest getIndexRequest = new GetIndexRequest.Builder().index("es_index_name").build();
GetIndexResponse getIndexResponse = elasticsearchClient.indices().get(getIndexRequest);
IndexState es_index_name = getIndexResponse.get("es_index_name");
System.out.println(JSON.toJSonString(es_index_name.mappings().properties()));
System.out.println(JSON.toJSonString(es_index_name.aliases()));
System.out.println(JSON.toJSonString(es_index_name.settings()));
}
@Test
public void deleteIndex() throws IOException {
List indexList = Collections.singletonList("es_index_name");
DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest.Builder().index(indexList).build();
DeleteIndexResponse deleteIndexResponse = elasticsearchClient.indices().delete(deleteIndexRequest);
System.out.println(deleteIndexResponse.acknowledged());
}
@Test
public void getESDataByIndexAndIdTest() throws Exception {
GetRequest getRequest = new GetRequest.Builder().index("person").id("1").build();
GetResponse personGetResponse = elasticsearchClient.get(getRequest, Person.class);
Person person = personGetResponse.source();
System.out.println(person);
}
@Test
public void existsdocument() throws IOException {
GetRequest getRequest = new GetRequest.Builder().index("person").id("4").build();
GetResponse personGetResponse = elasticsearchClient.get(getRequest, Person.class);
System.out.println(personGetResponse.source());
System.out.println(personGetResponse.found());
}
@Test
public void savedocument() throws IOException {
Person person = new Person();
person.setNickname("小奇同学");
person.setName("小奇");
person.setAge(1);
person.setSex(true);
IndexRequest personIndexRequest = new IndexRequest.Builder().index("person").id("7").document(person).build();
IndexResponse indexResponse = elasticsearchClient.index(personIndexRequest);
//结果成功为：Created
System.out.println(indexResponse.result());
}
@Test
public void updatedocument() throws IOException {
Person person = new Person();
// person.setNickname("里斯kitty");
person.setName("里斯1234");
//
// person.setSex(true);
// person.setAge(28);
// person.setSex(true);
UpdateRequest personPersonUpdateRequest = new UpdateRequest.Builder().index("person").id("4").doc(person).build();
UpdateResponse personUpdateResponse = elasticsearchClient.update(personPersonUpdateRequest, Person.class);
//结果成功为：Updated
System.out.println(personUpdateResponse.result());
}
@Test
public void getdocumentById() throws IOException {
GetRequest getRequest = new GetRequest.Builder().index("person").id("7").build();
GetResponse personGetResponse = elasticsearchClient.get(getRequest, Person.class);
System.out.println(personGetResponse.source());
System.out.println(personGetResponse.id());
}
@Test
public void search() throws IOException {
SearchRequest searchRequest = new SearchRequest.Builder().index("person").build();
SearchResponse personSearchResponse = elasticsearchClient.search(searchRequest, Person.class);
List> hits = personSearchResponse.hits().hits();
hits.forEach(hit ->{
System.out.println(hit.source());
});
}
@Test
public void searchByPages() throws IOException {
SearchRequest searchRequest = new SearchRequest.Builder().index("person").from(0).size(10).build();
SearchResponse personSearchResponse = elasticsearchClient.search(searchRequest, Person.class);
List> hits = personSearchResponse.hits().hits();
hits.forEach(hit ->{
System.out.println(hit.source());
});
}
}
