update javadocs link

Author: l-trotta

docs/reference/javadoc-source-code.md

@@ -5,8 +5,6 @@ mapped_pages:
 
 # Javadoc and source code [java-client-javadoc]
 
-TODO: Update to one with prefix of artifacts.elastic.co
-The Javadoc for the Java API Client is available at [https://javadoc.io/doc/co.elastic.clients/elasticsearch-java/](https://javadoc.io/doc/co.elastic.clients/elasticsearch-java/latest/index.html).
+The Javadoc for the Java API Client is available at [https://artifacts.elastic.co/javadoc/co/elastic/clients/elasticsearch-java](https://artifacts.elastic.co/javadoc/co/elastic/clients/elasticsearch-java/{{version}}/index.html).
 
 The source code is at [https://github.com/elastic/elasticsearch-java/](https://github.com/elastic/elasticsearch-java/) and is licensed under the Apache 2.0 License.
-