- Moved all settings in Marvel from `marvel.*` to `xpack.monitoring.*`
- Cleaned up marvel settings in general - they're all now under `MarvelSettings` class
- fixed some integration tests along the way (they were configured wrong and never actually tested anything)
- Updated the docs accordingly
- Added `migration-5_0.asciidoc` under the Marvel docs to explain how to migrate from Marvel 2.x to XPack 5.0.
- Replaced all `marvel` mentions in the logs to `monitoring`
- Removed the `xpack.monitoring.template.version` setting from the templates
- renamed the templates to `monitoring-es-data.json` and `monitoring-es.json`
- monitoring indices are now `.monitoring-es-<version>-data` and `.monitoring-es-<version>-<timestamp>`
Original commit: elastic/x-pack-elasticsearch@17f2abe17d