Elasticsearch vs. Azure Search

Elasticsearch is a distributed RESTful search engine with over 50 million downloads. Elasticsearch, Logstash, Kibana and Beats make up the "Elastic Stack" developed by Elastic. Hosted Elasticsearch (Elastic Cloud) is also provided.

Azure Search makes it easy to add powerful and sophisticated search capabilities to your website or application. Quickly and easily tune search results and construct rich, fine-tuned ranking models to tie search results to business goals. Reliable throughput and storage provide fast search indexing and querying to support time-sensitive search scenarios.