- core-default.xml updated so that fs.s3a.committer.magic.enabled = true
- CommitConstants updated to match
- All tests which previously enabled the magic committer now rely on
default settings. This helps make sure it is enabled.
- Docs cover the switch, mention its enabled and explain why you may
want to disable it.
Note: this doesn't switch to using the committer -it just enables the path
rewriting magic which it depends on.