Elastic Stack was recently added to the Microsfot Azure Marketplace by Elastic. Elastic was created in 2012 and has headquarters in both Mountain View, California and Amsterdam. They offer products, such as the Open Source Elasticsearch project, Kibana, Logstash and others.
Elastic has a backing, which includes many Venture Capitalists including Index Ventures and Benchmark Capital. With Microsoft and Elastic working together, they are able to use Elasticsearch to add new enhancements and automation with a Bring-Your-Own-License (BYOL) model.