In order to adhere to our elasticsearch core release script,
this script allows you to use a staging release to build x-plugins
against it, and then upload the created artifacts to the same
s3 bucket, so people can actually test the whole package of core
plus x-plugins.
Please read the documentation in the RELEASE.md document to understand
when to run which script!
Original commit: elastic/x-pack-elasticsearch@a43ce25b6f
Alexander Reelsen