Unable to make any request to elastic cloud

Elastic Stack Elasticsearch
1

Hi, I have been working with elasticsearch for about a year now in development using version 7.1 and the high level rest client (java), deployed my application to azure and created a free trial elastic deployment but unable to create index or make any request at all.

It keeps giving me the unknownHostException

2

Hey,

can you share some code, a full exception stack trace instead of just a part of it?

Thank you!

--Alex

3

This is how I am building my restclient

private synchronized RestHighLevelClient buildClient() {
log.info("Trying to connect to elastic <<<<<<<<<<<<<<<<<<<<<<<<<<");
try {
	if (restHighLevelClient == null) {
		final CredentialsProvider credentialsProvider =new BasicCredentialsProvider();
		credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials("myusername", "mypassword"));

		RestClientBuilder builder = RestClient.builder(new HttpHost(esHost, esPort));
		builder.setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
		restHighLevelClient = new RestHighLevelClient(builder);
		log.info("Connected Elasticsearch.... >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
	}
} catch (Exception e) {
	log.error(e.getMessage());
}
return restHighLevelClient;
}

and this is where I try to create an index

private boolean createIndex(String indexName) {
    Assert.notNull(indexName, "No index defined");
    CreateIndexRequest request = new CreateIndexRequest(indexName);
    try {
        CreateIndexResponse response = restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
        return response.isAcknowledged();
    } catch (Exception e) {
        throw new ElasticsearchException("Failed to create index " + indexName, e);
    }
}

When I do this with localhost it works fine but with the elastic cloud instance I get this

java.io.IOException: https://link-to-my-elastic.azurewebsites.com
at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:809)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:225)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:212)
at ai.test.elasticsearch.config.ElasticConfig.client(ElasticConfig.java:58)
at ai.test.elasticsearch.config.ElasticConfig$$EnhancerBySpringCGLIB$$a39d9fd2.CGLIB$client$2(<generated>)
at ai.test.elasticsearch.config.ElasticConfig$$EnhancerBySpringCGLIB$$a39d9fd2$$FastClassBySpringCGLIB$$aed02abf.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:358)
at ai.test.elasticsearch.config.ElasticConfig$$EnhancerBySpringCGLIB$$a39d9fd2.client(<generated>)
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:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
at ai.test.elasticsearch.Application.main(Application.java:12)
Caused by: java.net.UnknownHostException: https://mylink at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:637)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:608)
at org.apache.http.nio.pool.AbstractNIOConnPool.processPendingRequest(AbstractNIOConnPool.java:474)
at org.apache.http.nio.pool.AbstractNIOConnPool.lease(AbstractNIOConnPool.java:280)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.requestConnection(PoolingNHttpClientConnectionManager.java:268)
at org.apache.http.impl.nio.client.AbstractClientExchangeHandler.requestConnection(AbstractClientExchangeHandler.java:377)
at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.start(DefaultClientExchangeHandlerImpl.java:129)
at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:141)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:221)
... 44 more
4

There seems to be an issue with your application and DNS resolution - or more likely with the ability to do DNS resolution on that host.

Can you check that? Or just try with the IP address and see if that works as a first step to rule out DNS?

5

Okay. if this is a DNS resolution issue then can you suggest a fix cause I cannot connect both on my local machine and on the deployed app.

Thanks

6

Hey,

this is impossible to tell without any further knowledge about your local setup, why your local DNS is not working. This is why I suggested not using DNS names but IP adresses, to check if this is a DNS issue or maybe a more complex routing problem, that you cannot reach the elasticsearch instance from your app.

--Alex

7

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