I have worked in projects where i have used Elasticseach as a storage and search engine. The primary task was to match and identify patients visiting different healthcare facilities using the demographic information provided by different facilities. Elasticsearch is a fast search engine and can search and match records very fast and supports techniques like Fuzzy matching and calculates scores for any search. It also provides a match information metadata for all the searches.
I have good exposure to Elasticsarch index creation, DSL query writing for various kind of search operation, NEST queries in C#, Connecting elastic search from .net and python environments.