I wish after 1.x they had maintained backwards compatibility with upgrades as they had kind of promised... there is just so much money in making it hard to upgrade ;)
That consulting arm of Elastic needs something to do :)
More charitably, I can understand why they felt the need to make a hard break, but difficult upgrades plus fast release cycle means a fair bit of friction.
The no downtime upgrades will be nice, but on a big production system, I wouldn't feel comfortable upgrading major versions every 6 months.
