Extract javadoc artifact from version directory

Author: joheec

.buildkite/release_central.yml

@@ -15,7 +15,7 @@ steps:
     build:
       env:
         DESTINATION_PATH: "s3://artifacts.elastic.co/javadoc/co/elastic/clients/elasticsearch-java/"
-        EXTRACT_ARTIFACT: "elasticsearch-java-${VERSION}-javadoc.jar"
+        EXTRACT_ARTIFACT: "${VERSION}/elasticsearch-java-${VERSION}-javadoc.jar"
 
 #notify:
 #  - slack: "#devtools-notify"