Publish javadoc with publish to s3 service pipeline

Author: joheec

.buildkite/release_central.yml

@@ -7,6 +7,14 @@ steps:
     command: ".ci/release_central.sh"
     artifact_paths:
       - ".ci/output/repository/**/*"
+  - wait: ~
+  - label: "Publish S3 Artifacts :s3:"
+    trigger: unified-release-publish-s3-artifacts
+    key: publish-s3-service
+    build:
+      env:
+        DESTINATION_PATH: "s3://artifacts.elastic.co/javadoc/co/elastic/clients/elasticsearch-java/"
+        DRY_RUN: "true"
 
 #notify:
 #  - slack: "#devtools-notify"

docs/reference/javadoc-source-code.md

@@ -5,6 +5,7 @@ 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 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.