I don’t follow. ElasticSearch was only available under proprietary source-available licenses. Now, it’s also available under the AGPL, which is open source, meaning ElasticSearch is now open source software. What part of this is deceptive or contradictory?
Do you… not know how multi-licensing works? You can use the project’s code under the terms of whichever license you prefer, you don’t use all three at once. Simply putting the AGPLv3 does remove unfair restrictions, because it means you don’t have to use either of the proprietary licenses the project was previously only available under.