It has been a long time since I did anything with Elasticsearch and I wanted to give it a go again. So I spun up a Spring Boot application through the Spring Initializr and downloaded the latest and greatest Elasticsearch, version 8.x.x.
I then could not get it to work and found that Spring Data Elasticsearch 4.4.5 only supports Elasticsearch 7.17.6. So I downloaded that and did the following.
I added the following to $ES_HOME/config/elasticsearch.yml:
xpack.security.enabled: true
discovery.type: single-node
We are running Elasticsearch as a single node. That is why I set the discovery.type.
Then I started Elasticsearch and setup passwords. If you don’t enable security, Elasticsearch logs a message every time you send a request to it, stating you’re doing unsafe things.
I set the passwords by executing:
$ES_HOME/bin/elasticsearch-setup-passwords auto
Elasticsearch then spits out the passwords for the various accounts. As I am only playing around with Elasticsearch and this is no a production setting, I am using the elastic account in Spring Boot.
What I did next was configure Elasticsearch in Spring Boot:
@Configuration
public class ElasticConfiguration extends AbstractElasticsearchConfiguration {
@Override
public RestHighLevelClient elasticsearchClient() {
final ClientConfiguration clientConfiguration =
ClientConfiguration.builder()
.connectedTo("localhost:9200")
.withBasicAuth("elastic","<password>")
.build();
return RestClients.create(clientConfiguration).rest();
}
}
Of course you would want put the username and password in a configuration file and not code, but we are just horsing around here.
Then it is just a matter of making a repository and a storage object and you are good to go:
public interface UserRepository extends ElasticsearchRepository<User, String> {
}
The User object looks like this:
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
@Document(indexName = "user")
public class User {
@Id
private String id;
private String username;
private String department;
}
