从 Java 客户端连接到 Elastic Cloud

Question

I've been trying to connect to my ES instance on the Elastic cloud with no success using the Java client and following the Documentation In the hostname I put https://myinstance-xx.europe-west1.gcp.cloud.es.io

private String hostName = "https://myinstance-xx.es.europe-west1.gcp.cloud.es.io";
private String username = "username";
private String password = "pass";
@Bean
public ElasticsearchClient client() {
    final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    credentialsProvider.setCredentials(AuthScope.ANY,
            new UsernamePasswordCredentials(username, password));
    RestClientBuilder builder = RestClient.builder(new HttpHost(hostName, 9200))
            .setHttpClientConfigCallback(httpClientBuilder ->
                    httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));
    // Create the low-level client
    RestClient restClient = builder.build();
    // Create the transport with a Jackson mapper
    ElasticsearchTransport transport = new RestClientTransport(restClient, new JacksonJsonpMapper());
    // And create the API client
    return new ElasticsearchClient(transport);
}

However, I get an Connection Refused exception

java.net.ConnectException: Connection refused

What's the best way to connect to ES on Elastic Cloud through the Java Client?

Answer 1

1. Go to cloud.elastic.go/home after your are logged in, find the "Manage this deployment" link. It should be something like https://cloud.elastic.co/deployments/xxxxxxxx
2. Under "Applications" you should have an "Elasticsearch" enpoint (click on "Copy endpoint")
3. On the API console create an API Key:

POST /_security/api_key 
{
  "name": "my_key_name",
  "expiration": "15d"
}

That's gonna give you something like:

{
  "id": "API_KEY_ID",
  "name": "my_key_name",
  "expiration": 1670471984009,
  "api_key": "API_KEY",
  "encoded": "XxxxxxxxXXXXXxxxxxxXXXXxxxxxXXXX=="
}

4. Now in your Java code:

    // endpoint you copied String hostname = "youdepname.es.us-west1.gcp.cloud.es.io"; String apiKeyId = "API_KEY_ID"; String apiKeySecret = "API_KEY"; String apiKeyAuth = Base64.getEncoder().encodeToString( (apiKeyId + ":" + apiKeySecret).getBytes(StandardCharsets.UTF_8)); RestClientBuilder builder = RestClient.builder( new HttpHost(hostname, 9243, "https")).setRequestConfigCallback( new RestClientBuilder.RequestConfigCallback() { @Override public RequestConfig.Builder customizeRequestConfig( RequestConfig.Builder requestConfigBuilder) { return requestConfigBuilder.setConnectTimeout(5000).setSocketTimeout(60000); } }); Header[] defaultHeaders = new Header[]{new BasicHeader("Authorization", "ApiKey " + apiKeyAuth)}; builder.setDefaultHeaders(defaultHeaders); RestClient restClient = builder.build(); // Create the transport with a Jackson mapper ElasticsearchTransport transport = new RestClientTransport( restClient, new JacksonJsonpMapper()); // And create the API client ElasticsearchClient client = new ElasticsearchClient(transport);

That should do it. There are other ways to connect, but this is my preferred way.