add apikey authentication support to quarkus-elasticsearch-rest-client

[yujietan]

Description

Hi right now only username/password auth is supported in the rest client. The elasticsearch cluster that i am connecting to is using apikey auth.
https://quarkus.io/guides/elasticsearch#quarkus-elasticsearch-rest-client_quarkus-elasticsearch-username

Can i request to add apikey auth support to this rest client?

Implementation ideas

No response

[quarkus-bot]

/cc @cescoffier (rest-client), @geoand (rest-client), @gsmet (elasticsearch), @loicmathieu (elasticsearch), @marko-bekhta (elasticsearch), @yrodiere (elasticsearch)

[yrodiere]

Hello,

The low-level REST client supports API key authentication by configuring it this way: https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/_other_authentication_methods.html#_elasticsearch_api_keys

In Quarkus, you can set such configuration through a custom bean annotated with @ElasticsearchClientConfig and implementing RestClientBuilder.HttpClientConfigCallback: https://quarkus.io/guides/elasticsearch#programmatically-configuring-elasticsearch

If you want to add support for directly setting the API key through configuration, I think that's a good idea, and should not be too hard; pull requests welcome!

For anyone wanting to implement this, the implementation would boil down to:

1. Adding the necessary configuration property (apiKey()?) in this class, below username/password:
   https://github.com/quarkusio/quarkus/blob/9df0cdb80b055658ce122b2c87289ecd083ae8aa/extensions/elasticsearch-rest-client/runtime/src/main/java/io/quarkus/elasticsearch/restclient/lowlevel/runtime/ElasticsearchConfig.java#L40-L39
2. Adding the necessary logic here to propagate the configuration to the Elasticsearch Rest client as explained above:
   

   quarkus/extensions/elasticsearch-rest-client/runtime/src/main/java/io/quarkus/elasticsearch/restclient/lowlevel/runtime/RestClientBuilderHelper.java

   Lines 56 to 66 in 9df0cdb

   	public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
   	if (config.username().isPresent()) {
   	if (!"https".equalsIgnoreCase(config.protocol())) {
   	LOG.warn("Using Basic authentication in HTTP implies sending plain text passwords over the wire, " +
   	"use the HTTPS protocol instead.");
   	}
   	CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
   	credentialsProvider.setCredentials(AuthScope.ANY,
   	new UsernamePasswordCredentials(config.username().get(), config.password().orElse(null)));
   	httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
   	}

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