With ES5 released, I wonder whether it would be possible to downgrade to ES2.4 somehow, if something fails?
The exact question is: is it possible to do these steps?
- in-place (or backup/restore) upgrade from ES2.4 to ES5
- use ES5 for some time (not using any of its new features, no new indexes or mappings created)
- backup (from ES5) and restore the data to an ES2.4 cluster