Spring boot connect to Elasticsearch with basic authentication

If you using <artifactId>spring-boot-starter-data-elasticsearch</artifactId> dependency you need specify username and password via Basic Authentication.

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;
import org.springframework.data.elasticsearch.core.ElasticsearchOperations;
import org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate;
import org.springframework.data.elasticsearch.repository.config.EnableElasticsearchRepositories;

@Configuration
@EnableElasticsearchRepositories(basePackages = "yourpackage.domain.elastic")
public class ElasticConfig {
    @Value("${elasticsearch.host}")
    private String host;
    @Value("${elasticsearch.username}")
    private String username;
    @Value("${elasticsearch.password}")
    private String password;

    @Bean
    public RestHighLevelClient client() {
        ClientConfiguration clientConfiguration
                = ClientConfiguration.builder()
                .connectedTo(host)
                .withBasicAuth(username, password) // put your credentials
                .build();
        return RestClients.create(clientConfiguration).rest();
    }

    @Bean
    public ElasticsearchOperations elasticsearchTemplate() {
        return new ElasticsearchRestTemplate(client());
    }
}

    final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    credentialsProvider.setCredentials(AuthScope.ANY,
            new UsernamePasswordCredentials("username", "password"));

    final RestClientBuilder builder = RestClient.builder(new HttpHost("localhost", 9200))
            .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
                @Override
                public HttpAsyncClientBuilder customizeHttpClient(
                        HttpAsyncClientBuilder httpClientBuilder) {
                    httpClientBuilder.disableAuthCaching();
                    return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
                }
            });

    final RestClient restClient = builder.build();
    final Response result = restClient.performRequest("GET", "_index/blahblah",
                Collections.emptyMap());

@saeedj: I followed https://www.elastic.co/guide/en/elasticsearch/client/java-rest/6.x/_basic_authentication.html

You can try it :)

Remove the transport client from the Try-with-resources, the client is being closed when you leave the "try". You may have an error from Sonar or similar code reviewer. That was the solution I found.