The module is now free, but it's not open source, it is licensed under the proprietary Elastic license. The source is available but it is not licensed to be use

The module is now free, but it's not open source, it is licensed under the proprietary Elastic license. The source is available but it is not licensed to be used with anything except the Elastic licensed version of Elasticsearch (not even the Apache licensed version of Elasticsearch) However, Amazon has thankfully released a free and open source security module for Elasticsearch as part of their Open Distro project. It is based on another project called Search Guard. See: https://opendistro.github.io/ https://opendistro.github.io/