" Unfortunately, since June 2018, we have witnessed significant intermingling of proprietary code into the code base. While an Apache 2.0 licensed download is still available, there is an extreme lack of clarity as to what customers who care about open source are getting and what they can depend on. For example, neither release notes nor documentation make it clear what is open source and what is proprietary. Enterprise developers may inadvertently apply a fix or enhancement to the proprietary source code. This is hard to track and govern, could lead to breach of license, and could lead to immediate termination of rights (for both proprietary free and paid). Individual code commits also increasingly contain both open source and proprietary code, making it very difficult for developers who want to only work on open source to contribute and participate. In addition, the innovation focus has shifted from furthering the open source distribution to making the proprietary distribution popular. This means that the majority of new Elasticsearch users are now, in fact, running proprietary software. We have discussed our concerns with Elastic, the maintainers of Elasticsearch, including offering to dedicate significant resources to help support a community-driven, non-intermingled version of Elasticsearch. They have made it clear that they intend to continue on their current path. "