ServiceDiscovery ERROR HCServiceDiscovery: Unable to refresh addresses: Cannot invoke "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo$PublishAddress.getPublishAddress()"

[gpadbidri]

I get the following exception when I try to add elasticsearch appender support for my basic sample. I have also attached my resources folder to show my appender settings. I am unable to understand what could have gone wrong. Kindly let me know. Thanks !

BatchEmitter ERROR PutIndexTemplate: Unable to update index template: Bad Request. status: 400. Root error: errorType: x_content_parse_exception, errorReason: [2:3] [index_template] unknown field [mappings]
2023-08-07 18:48:29,767 ServiceDiscovery ERROR HCServiceDiscovery: Unable to refresh addresses: Cannot invoke "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo$PublishAddress.getPublishAddress()" because the return value of "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo.getHttpPublishAddress()" is null java.lang.NullPointerException: Cannot invoke "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo$PublishAddress.getPublishAddress()" because the return value of "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo.getHttpPublishAddress()" is null
at org.appenders.log4j2.elasticsearch.hc.discovery.ElasticsearchNodesQuery.formatAddress(ElasticsearchNodesQuery.java:89)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
at org.appenders.log4j2.elasticsearch.hc.discovery.ElasticsearchNodesQuery.execute(ElasticsearchNodesQuery.java:81)
at org.appenders.log4j2.elasticsearch.hc.discovery.ElasticsearchNodesQuery.execute(ElasticsearchNodesQuery.java:36)
at org.appenders.log4j2.elasticsearch.hc.discovery.HCServiceDiscovery.refresh(HCServiceDiscovery.java:92)
at org.appenders.log4j2.elasticsearch.hc.discovery.HCServiceDiscovery$RefreshServerList.run(HCServiceDiscovery.java:170)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
resources.zip

at java.base/java.lang.Thread.run(Thread.java:833)

2023-08-07 18:48:34,777 ServiceDiscovery ERROR HCServiceDiscovery: Unable to refresh addresses: Cannot invoke "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo$PublishAddress.getPublishAddress()" because the return value of "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo.getHttpPublishAddress()" is null java.lang.NullPointerException: Cannot invoke "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo$PublishAddress.getPublishAddress()" because the return value of "org.appenders.log4j2.elasticsearch.hc.discovery.NodeInfo.getHttpPublishAddress()" is null
at org.appenders.log4j2.elasticsearch.hc.discovery.ElasticsearchNodesQuery.formatAddress(ElasticsearchNodesQuery.java:89)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1845)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
at org.appenders.log4j2.elasticsearch.hc.discovery.ElasticsearchNodesQuery.execute(ElasticsearchNodesQuery.java:81)
at org.appenders.log4j2.elasticsearch.hc.discovery.ElasticsearchNodesQuery.execute(ElasticsearchNodesQuery.java:36)
at org.appenders.log4j2.elasticsearch.hc.discovery.HCServiceDiscovery.refresh(HCServiceDiscovery.java:92)
at org.appenders.log4j2.elasticsearch.hc.discovery.HCServiceDiscovery$RefreshServerList.run(HCServiceDiscovery.java:170)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)

Following is my Application.java code :

`@SpringBootApplication
public class Application {

public static void main(String... args) {

    ConfigurableApplicationContext applicationContext =
            SpringApplication.run(Application.class, args);

    long number = 123;
    Logger logger = LogManager.getLogger("elasticsearch");
    LogDTO dto = new LogDTO("123", LogType.Technology, LogLevel.INFO);
    dto.setAccountId(Long.valueOf(number));
    dto.setClientId(Long.valueOf(number));
    dto.setUserId(Long.valueOf(number));
    dto.setMessage("Hello, World! from HC Spring Boot = " + number);
    dto.setEntityId(Long.valueOf(number));
    dto.setEntityName("Application");
    dto.setMethodName("Main STATIC");
    dto.setServiceName("Logger Service");

  //  ThreadContext.put("myFavouriteVariable", UUID.randomUUID().toString());
 //   ThreadContext.put("myStructuredJSON", "{\"yes\":100,\"you\":\"can\"}");
  //  logger.info("Hello, World! from HC Spring Boot 6661");
    logger.info(dto);
  //  ThreadContext.remove("myFavouriteVariable");
  //  ThreadContext.remove("myStructuredJSON");

   LockSupport.parkNanos(TimeUnit.SECONDS.toNanos(5));

  //applicationContext.close();

// LoggingSystem.get(logger.getClass().getClassLoader()).getShutdownHandler().run();
}

}
`

[rfoltyns]

BatchEmitter ERROR PutIndexTemplate: Unable to update index template: Bad Request. status: 400. Root error: errorType: x_content_parse_exception, errorReason: [2:3] [index_template] unknown field [mappings]
indicates that you're using a template for Elasticsearch 7 against Elasticsearch 8 (or the other way around...). Template file must be compatible with Es verison that you use/ Examples may be outdated unfortunately.