Regarding the Matrix - some users might find this useful but currently we just need a few sentences to describe what is needed and what not working.
That can be found in the documentation: http://docs.graylog.org/en/2.4/pages/installation.html#system-requirements
As our documentation can be modified with a PR - feel free to provide this matrix for others. Earlier version of Graylog had the need of a list to look at the ES Versions, but the current release is using the HTTP API of ES what does not bound to a specific release.