Note on the ossinsights data point, there are 115 public repos in https://github.com/opensearch-project, including, as an example https://github.com/opensearch-project/k-nn where all vector search is written, or https://github.com/opensearch-project/neural-search.

OpenSearch only requires DCO.

https://github.com/opensearch-project/.github/blob/main/CONT...

You're right about documentation and tooling. There's some good momentum in the OpenSearch community around it though, and I am really excited by things like https://github.com/opensearch-project/documentation-website/....

"Elasticsearch" seems to be often referred to as a technology, as in ELK stack, rather than as in "Elastic" the company.