A number of unused files still exist for maven assemblies and ant
integration test overrides. This change removes them. There are still
some files left which need to be examined more, for instance, the shield
overrides ant file.
Original commit: elastic/x-pack-elasticsearch@1d9b277ff0
This commit changes the groupId to the above mentioned one
so that S3 uploads will end up in the right bucket. This will
allow the Elasticsearch plugin manager to install the commercial
plugins like
```
bin/plugin install {watcher,shield,license,marvel}
```
like the official ones.
Original commit: elastic/x-pack-elasticsearch@642f1f006a
Ryan Ernst
David Pilato
Alexander Reelsen
Robert Muir
jaymode
uboness