I have recently came across this java doc for apache beam. But I couldn't find any relevant jar file with above package.
The process applies to other artifacts.
Look for the directory in the repo. The source code locates under https://github.com/apache/beam/tree/master/sdks/java/io/amazon-web-services2.
Search the directory name in Maven Central. Search amazon-web-services2
in maven central https://search.maven.org/ and you can get the artifact: https://search.maven.org/search?q=amazon-web-services2