Connect to Elastic Cloud from the Java Client - elasticsearch

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

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
Under "Applications" you should have an "Elasticsearch" enpoint (click on "Copy endpoint")
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=="
}
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.