Unfork or Maintain Upstream

[macohen]

@aparo, @gsingers: In order to integrate into the OpenSearch project, I think we'll want to unfork so we can create issues there, but I wanted to check-in with both of you on that since it's not something we can revert later. I think this is the way to do it if we want to move forward. Otherwise, would we use this repo for issues and continue to use this as upstream?