From the most recent news item on the link you posted: “In the coming weeks this website (https://opendistro.github.io/for-elasticsearch/) will be selectively decommissioned and/or forwarded to the corresponding OpenSearch.org content.”

Having used Open Distro for a little while, I really don't have high hopes for this project, although I would like to be proved wrong.

Open Distro was largely unloved - lots of Github issues remaining untriaged, and various small but poor technical decisions. I've seen FOSS projects that don't have massive corporate backing handle their projects better.

Perhaps the license change will force Amazon to put more resources into the project.