Spring elasticsearch java.net.UnknownHostException - spring-data-elasticsearch

Question

Trying to update a small experimental Spring Elasticsearch project to reflect changes in the 3.2.6 release reference guide.
As noted: TransportClient is deprecated as of Elasticsearch 7 and will be removed in 8. Trying to reconfig to High Level Rest Client.
But getting the following errors
Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'elasticDatasource' defined in file [/Users/erichuang/Desktop/JE/00-Development/dev/lab/lab-elastic-search/lab-elastic-search/target/classes/com/elastic/labelasticsearch/config/ElasticDatasource.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'carElasticRepo': Invocation of init method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is org.springframework.data.elasticsearch.ElasticsearchException: Error while for indexExists request: org.elasticsearch.action.admin.indices.get.GetIndexRequest#b5d8ebb
org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
com.elastic.labelasticsearch.LabElasticSearchApplication.main(LabElasticSearchApplication.java:15)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'carElasticRepo': Invocation of init method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is org.springframework.data.elasticsearch.ElasticsearchException: Error while for indexExists request: org.elasticsearch.action.admin.indices.get.GetIndexRequest#b5d8ebb
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796)
... 24 common frames omitted
Caused by: java.net.UnknownHostException: localhost/<unresolved>: nodename nor servname provided, or not known
at java.base/java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.base/java.net.InetAddress$PlatformNameService.lookupAllHostAddr(InetAddress.java:932)
at java.base/java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1505)
at java.base/java.net.InetAddress$NameServiceAddresses.get(InetAddress.java:851)
at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1495)
at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1354)
at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1288)
...
... 63 common frames omitted
Old setup (works)
ElasticSearchConfig
#Configuration
#EnableElasticsearchRepositories(basePackages = "com.elastic.labelasticsearch.repo")
public class ElasticSearchConfig {
private static final String esHost = "localhost";
private static final int esPort = 9300;
#Bean
public Client client() throws UnknownHostException {
var transportClient = new PreBuiltTransportClient(Settings.EMPTY);
transportClient.addTransportAddress(new TransportAddress(InetAddress.getByName(esHost), esPort));
return transportClient;
}
#Bean(name ={"elasticsearchOperations", "elasticsearchTemplate"})
public ElasticsearchOperations esTemplate() throws UnknownHostException {
return new ElasticsearchTemplate(client());
}
#Bean
public RestTemplate restTemplate(){
return new RestTemplate();
}
}
New Setup
#Configuration
#EnableElasticsearchRepositories(basePackages = "com.elastic.labelasticsearch.repo")
public class RestClientConfig extends AbstractElasticsearchConfiguration {
#Override
#Bean
public RestHighLevelClient elasticsearchClient() {
final ClientConfiguration clientConfiguration = ClientConfiguration.builder()
.connectedTo("localhost:9300")
.build();
return RestClients.create(clientConfiguration).rest();
}
}
What am I missing?

Answer 1

This is a bug resulting from as change in Java 14 in the java.net.InetSocketAddress.toString() method. This has been fixed in 4.0.RC2 (released yesterday).
Edit: I will backport this into the 3.2 branch as well

Answer 2

You will need to configure your bean using this way that allow to separate the host port and http protocol used:
#Configuration
#EnableElasticsearchRepositories(basePackages = "*")
public class ElasticsearchClientConfig {
#Value("${elasticsearch.host}")
private String host;
#Value("${elasticsearch.port}")
private int port;
#Value("${elasticsearch.protocol}")
private String protocol;
#Value("${elasticsearch.username}")
private String userName;
#Value("${elasticsearch.password}")
private String password;
#Bean(destroyMethod = "close")
public RestHighLevelClient restClient() {
final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(userName, password));
RestClientBuilder builder = RestClient.builder(new HttpHost(host, port, protocol)).setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
RestHighLevelClient client = new RestHighLevelClient(builder);
return client;
}
}