There's no way that Elastic would accept the Open Distro features as a contribution to Elasticsearch because they include inferior versions of features already

There's no way that Elastic would accept the Open Distro features as a contribution to Elasticsearch because they include inferior versions of features already available in the commercially-licensed version of Elasticsearch and, in the case of the Search Guard code in Open Distro, code that Elastic alleges was lifted from existing commercially-licensed Elasticsearch features. AWS knows all this but offers it anyway as a PR stunt so they can say that they at least attempted to make contributions to Elasticsearch.