文章目录

• • 情景再现
  • 完整报错信息
  • 报错原因和解决方法
  • 我的疑问

笔记待改

报错：
ElasticsearchStatusException[Elasticsearch exception [type=resource_already_exists_exception, reason=index [discusspost/3IyXwPzXQ06z7uwDN-z5Zw] already exists]
]

情景再现

一句话来说，就是用testDeleteIndex()方法删除了叫做”discusspost”的索引后，又用testCreateIndex()创建了叫做”discusspost”的索引，并往该索引里插入了数据。然后在testCreateIndex()方法里的createIndex()方法处报错。

application.properties

# ElasticsearchPropertieselasticSearch.url=127.0.0.1:9200elasticsearch.indices=discusspost

EsConfig

import org.elasticsearch.client.RestHighLevelClient;import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.elasticsearch.client.ClientConfiguration;import org.springframework.data.elasticsearch.client.RestClients;@Configurationpublic class EsConfig {        @Value("${elasticSearch.url}")    private String esUrl;    //localhost:9200 写在配置文件中就可以了    @Bean    RestHighLevelClient client() {            ClientConfiguration clientConfiguration = ClientConfiguration.builder()                .connectedTo(esUrl)//elasticsearch地址                .build();        return RestClients.create(clientConfiguration).rest();    }}

pom.xml

<properties><java.version>1.8</java.version><elasticsearch.version>7.12.0</elasticsearch.version></properties><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-elasticsearch</artifactId></dependency>

DiscussPost

import org.springframework.data.annotation.Id;import org.springframework.data.elasticsearch.annotations.Document;import org.springframework.data.elasticsearch.annotations.Field;import org.springframework.data.elasticsearch.annotations.FieldType;import java.util.Date;@Document(indexName = "discusspost", /*type = "_doc",*/ shards = 6, replicas = 3)public class DiscussPost {        @Id    private int id;    @Field(type = FieldType.Integer)    private int userId;    // 互联网校招    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")    private String title;    @Field(type = FieldType.Text, analyzer = "ik_max_word", searchAnalyzer = "ik_smart")    private String content;    @Field(type = FieldType.Integer)    private int type;    @Field(type = FieldType.Integer)    private int status;    @Field(type = FieldType.Date)    private Date createTime;    @Field(type = FieldType.Integer)    private int commentCount;    @Field(type = FieldType.Double)    private double score;//get、set方法、toString方法}

ElasticsearchTests

@SpringBootTest@ContextConfiguration(classes = CommunityApplication.class)public class ElasticsearchTests { @Autowiredprivate DiscussPostMapper discussMapper;@Autowiredprivate DiscussPostRepository discussRepository;@Qualifier("client")@Autowiredprivate RestHighLevelClient restHighLevelClient;@Value("${elasticsearch.indices}")String esIndices;@Testpublic void testExistsIndex() throws Exception { System.out.println(existsIndex(esIndices));}@Testpublic void testCreateIndex() throws Exception { System.out.println(createIndex(esIndices));//把所有帖子（List<DiscussPost>）存入es的discusspost索引（es的索引相当于数据库的表）discussRepository.saveAll(discussMapper.selectAllDiscussPosts());}@Testpublic void testDeleteIndex() throws Exception { discussRepository.deleteAll();//删除所有数据System.out.println(deleteIndex(esIndices));}//判断索引是否存在public boolean existsIndex(String index) throws IOException { GetIndexRequest request = new GetIndexRequest(index);boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);return exists;}//创建索引public boolean createIndex(String index) throws IOException { CreateIndexRequest request = new CreateIndexRequest(index);CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);return createIndexResponse.isAcknowledged();}//删除索引public boolean deleteIndex(String index) throws IOException { DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest(index);AcknowledgedResponse response = restHighLevelClient.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);return response.isAcknowledged();}}

完整报错信息

[discusspost/3IyXwPzXQ06z7uwDN-z5Zw] ElasticsearchStatusException[Elasticsearch exception [type=resource_already_exists_exception, reason=index [discusspost/3IyXwPzXQ06z7uwDN-z5Zw] already exists]]at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:176)at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1933)at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1910)at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1667)at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1639)at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1606)at org.elasticsearch.client.IndicesClient.create(IndicesClient.java:134)at com.nowcoder.community.ElasticsearchTests.createIndex(ElasticsearchTests.java:218)at com.nowcoder.community.ElasticsearchTests.testCreateIndex(ElasticsearchTests.java:197)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:497)at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:688)at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:149)at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:140)at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:84)at org.junit.jupiter.engine.execution.ExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(ExecutableInvoker.java:115)at org.junit.jupiter.engine.execution.ExecutableInvoker.lambda$invoke$0(ExecutableInvoker.java:105)at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:104)at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:98)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:210)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:206)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:131)at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)at java.util.ArrayList.forEach(ArrayList.java:1249)at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)at java.util.ArrayList.forEach(ArrayList.java:1249)at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:75)at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:71)at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)Suppressed: org.elasticsearch.client.ResponseException: method [PUT], host [http://127.0.0.1:9200], URI [/discusspost?master_timeout=30s&timeout=30s], status line [HTTP/1.1 400 Bad Request]{"error":{"root_cause":[{"type":"resource_already_exists_exception","reason":"index [discusspost/3IyXwPzXQ06z7uwDN-z5Zw] already exists","index_uuid":"3IyXwPzXQ06z7uwDN-z5Zw","index":"discusspost"}],"type":"resource_already_exists_exception","reason":"index [discusspost/3IyXwPzXQ06z7uwDN-z5Zw] already exists","index_uuid":"3IyXwPzXQ06z7uwDN-z5Zw","index":"discusspost"},"status":400}at org.elasticsearch.client.RestClient.convertResponse(RestClient.java:326)at org.elasticsearch.client.RestClient.performRequest(RestClient.java:296)at org.elasticsearch.client.RestClient.performRequest(RestClient.java:270)at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1654)... 70 more

报错原因和解决方法

报错原因：分词器反复创建：先用standard分词器建的index，然后使用ik分词器又建索引出现这个错误，相当于对已有的index修改mapping，同样之前用standard建的索引，现在换成用ik分词器搜也搜不出来RestHighLevelClient的TermQuery。

解决方法：直接注释掉createIndex()方法，不创建索引就好了。你之前已经删除掉了索引”discusspost”，es里是没有”discusspost”索引的。但实体类”DiscussPost”里有”indexName = “discusspost””，你往索引里插入数据时，索引就自动存在了。

    @Testpublic void testCreateIndex() throws Exception { //System.out.println(createIndex(esIndices));//把所有帖子（List<DiscussPost>）存入es的discusspost索引（es的索引相当于数据库的表）discussRepository.saveAll(discussMapper.selectAllDiscussPosts());}//创建索引public boolean createIndex(String index) throws IOException { CreateIndexRequest request = new CreateIndexRequest(index);CreateIndexResponse createIndexResponse = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);return createIndexResponse.isAcknowledged();}

我的疑问

问题：我用testDelete()方法把索引中的数据全部删掉，我用elasticsearch-head http://127.0.0.1:9100/刷新看了，数据确实都删掉了，然后用testInsert()方法插入一条数据，但此时，所有数据都插入了。

    //删除一条数据和删除所有数据@Testpublic void testDelete() { //discussRepository.deleteById(109);//删除一条数据discussRepository.deleteAll();//删除所有数据}//一次保存一条数据@Testpublic void testInsert() { //把id为241的DiscussPost的对象保存到discusspost索引（es的索引相当于数据库的表）discussRepository.save(discussMapper.selectDiscussPostById(241));}

问题：我用testDeleteIndex()删除所有数据再删除索引，我用elasticsearch-head http://127.0.0.1:9100/刷新看了，索引确实删掉了，然后用testInsert()方法插入一条数据，但此时，所有数据都插入了。

    @Testpublic void testDeleteIndex() throws Exception { discussRepository.deleteAll();//删除所有数据System.out.println(deleteIndex(esIndices));}//删除索引public boolean deleteIndex(String index) throws IOException { DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest(index);AcknowledgedResponse response = restHighLevelClient.indices().delete(deleteIndexRequest, RequestOptions.DEFAULT);return response.isAcknowledged();}//一次保存一条数据@Testpublic void testInsert() { //把id为241的DiscussPost的对象保存到discusspost索引（es的索引相当于数据库的表）discussRepository.save(discussMapper.selectDiscussPostById(241));}