[maven] rename artifactIds from `elasticsearch-something` to `something`
[maven] rename artifactIds from `elasticsearch-something` to `something`

In plugins, we are using non consistent naming. We use `elasticsearch-cloud-aws` as the artifactId, which generates a jar file called `elasticsearch-cloud-aws-VERSION.jar`.

But when you want to install the plugin, you will end up with a shorter name for the plugin `cloud-aws`.

```
bin/plugin install cloud-aws
```

This commit changes that and use consistent names for `artifactId`, so `finalName`.

Also changed maven names.

johnwilliams/cloud-aws