Elasticsearch stops working after I run the springboot Java program and elasticsearch transport node is not loading in my Java Program

Elasticsearch version 8.1.3 Java version 1.8

Im trying to connect elasticsearch with Java springboot program. My Elasticsearch works fine until I run the Java program, also my java program works fine but with “.d.e.r.s.AbstractElasticsearchRepository : failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{LsJSQJtCS56wr7IM_S0h4Q}{localhost}{127.0.0.1:9300}]” on springboot error. Also, as soon as I run my program as java application elasticsearch stops working with “[WARN ][o.e.x.c.s.t.n.SecurityNetty4Transport] [DESKTOP-ADQ0I0S] received plaintext traffic on an encrypted channel, closing connection Netty4TcpChannel{localAddress=/127.0.0.1:9300, remoteAddress=/127.0.0.1:59255, profile=default}“

My pom.xml file

    <?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>

4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.elasticsearch</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-elasticsearch-example</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>

</properties>
<dependencies>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <excludes>
                    <exclude>
                        <groupId>org.projectlombok</groupId>
                        <artifactId>lombok</artifactId>
                    </exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>

Application.properties file

    spring.data.elasticsearch.cluster-name=mycluster
spring.data.elasticsearch.cluster-nodes=localhost:9300

Output of my java program

  .   ____          _            __ _ _
 /\ / ___'_ __ _ _(_)_ __  __ _    
( ( )___ | '_ | '_| | '_ / _` |    
 \/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |___, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.1.RELEASE)

2022-04-22 20:53:48.890  INFO 18300 --- [  restartedMain] pringBootElasticsearchExampleApplication : Starting SpringBootElasticsearchExampleApplication on DESKTOP-ADQ0I0S with PID 18300 (started by Hp in D:STS Projectdemo)
2022-04-22 20:53:48.895  INFO 18300 --- [  restartedMain] pringBootElasticsearchExampleApplication : No active profile set, falling back to default profiles: default
2022-04-22 20:53:49.012  INFO 18300 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2022-04-22 20:53:49.012  INFO 18300 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2022-04-22 20:53:50.085  INFO 18300 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2022-04-22 20:53:50.169  INFO 18300 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 77ms. Found 1 repository interfaces.
2022-04-22 20:53:51.242  INFO 18300 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2022-04-22 20:53:51.280  INFO 18300 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2022-04-22 20:53:51.281  INFO 18300 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/9.0.13
2022-04-22 20:53:51.302  INFO 18300 --- [  restartedMain] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [D:STSsts-4.13.0.RELEASEpluginsorg.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64_17.0.1.v20211116-1657jrebin;C:WindowsSunJavabin;C:Windowssystem32;C:Windows;D:/STS/sts-4.13.0.RELEASE//plugins/org.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64_17.0.1.v20211116-1657/jre/bin/server;D:/STS/sts-4.13.0.RELEASE//plugins/org.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64_17.0.1.v20211116-1657/jre/bin;C:Program Files (x86)Common FilesOracleJavajavapath;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:WindowsSystem32OpenSSH;C:Program Filesnodejs;C:Program FilesJavajdk1.8.0_202bin;C:Program FilesGitcmd;C:Program Filesdotnet;C:Program FilesMicrosoft SQL ServerClient SDKODBC170ToolsBinn;C:Program Files (x86)Microsoft SQL Server150ToolsBinn;C:Program FilesMicrosoft SQL Server150ToolsBinn;C:Program FilesMicrosoft SQL Server150DTSBinn;C:Program Files (x86)Microsoft SQL Server150DTSBinn;C:Program FilesAzure Data Studiobin;C:Program FilesDockerDockerresourcesbin;C:ProgramDataDockerDesktopversion-bin;C:Program FilesMySQLMySQL Shell 8.0bin;C:UsersHpAppDataLocalMicrosoftWindowsApps;;C:UsersHpAppDataLocalProgramsMicrosoft VS Codebin;C:UsersHpAppDataRoamingnpm;C:Program FilesAzure Data Studiobin;C:Program FilesAzure Data Studiobin;C:Program FilesJetBrainsIntelliJ IDEA Community Edition 2022.1bin;;D:STSsts-4.13.0.RELEASE;;.]
2022-04-22 20:53:51.464  INFO 18300 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2022-04-22 20:53:51.464  INFO 18300 --- [  restartedMain] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2452 ms
2022-04-22 20:53:51.996  INFO 18300 --- [  restartedMain] o.elasticsearch.plugins.PluginsService   : no modules loaded
2022-04-22 20:53:51.997  INFO 18300 --- [  restartedMain] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.index.reindex.ReindexPlugin]
2022-04-22 20:53:51.997  INFO 18300 --- [  restartedMain] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.join.ParentJoinPlugin]
2022-04-22 20:53:51.998  INFO 18300 --- [  restartedMain] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.percolator.PercolatorPlugin]
2022-04-22 20:53:51.998  INFO 18300 --- [  restartedMain] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.script.mustache.MustachePlugin]
2022-04-22 20:53:51.998  INFO 18300 --- [  restartedMain] o.elasticsearch.plugins.PluginsService   : loaded plugin [org.elasticsearch.transport.Netty4Plugin]
2022-04-22 20:53:53.600  INFO 18300 --- [  restartedMain] o.s.d.e.c.TransportClientFactoryBean     : Adding transport node : 127.0.0.1:9300
2022-04-22 20:53:53.962  INFO 18300 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2022-04-22 20:53:53.985 ERROR 18300 --- [  restartedMain] .d.e.r.s.AbstractElasticsearchRepository : failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{LsJSQJtCS56wr7IM_S0h4Q}{localhost}{127.0.0.1:9300}]
2022-04-22 20:53:54.354  INFO 18300 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2022-04-22 20:53:54.920  INFO 18300 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2022-04-22 20:53:54.924  INFO 18300 --- [  restartedMain] pringBootElasticsearchExampleApplication : Started SpringBootElasticsearchExampleApplication in 6.707 seconds (JVM running for 8.106)

Error I get on elasticsearch terminal as soon as I run the Java program

[2022-04-22T20:46:04,821][INFO ][o.e.i.g.DatabaseNodeService] [DESKTOP-ADQ0I0S] successfully loaded geoip database file [GeoLite2-City.mmdb]
[2022-04-22T20:53:53,786][WARN ][o.e.x.c.s.t.n.SecurityNetty4Transport] [DESKTOP-ADQ0I0S] received plaintext traffic on an encrypted channel, closing connection Netty4TcpChannel{localAddress=/127.0.0.1:9300, remoteAddress=/127.0.0.1:59255, profile=default}

To access Elasticsearch with Java I have followed this YouTube video tutorial [1]: https://www.youtube.com/watch?v=dlChXjE7IHw&t=541s

Also, im not able to add the type and shards parameter in the @Document annotation in my model. it is only accepting

@Document(indexName= "myindex")

According to the video it should be

@Document(indexName= "myindex" type="customer", shards=2)

elasticsearch.yml file

cluster.name: mycluster
path.data: D:STS Projectdemo
action.auto_create_index: .monitoring*,.watches,.triggered_watches,.watcher-history*,.ml*
xpack.security.enabled: true

xpack.security.enrollment.enabled: true
xpack.security.http.ssl:
  enabled: true
  keystore.path: certs/http.p12

xpack.security.transport.ssl:
  enabled: true
  verification_mode: certificate
  keystore.path: certs/transport.p12
  truststore.path: certs/transport.p12

cluster.initial_master_nodes: ["DESKTOP-ADQ0I0S"]

http.host: [_local_, _site_]

Answer

I was using transport client 9300 which is deprecated in Elasticsearch 7 and not supported in version 8 and I was using version 8.1.3. Here we can use the supported Elastic version 7.x or use Elasticsearch Java API client. [Elasticsearch Java API Client 8.1.3] Elasticsearch Java API Client 8.1.3