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NEST. The two official .NET clients for Elasticsearch.
Why two clients?edit
Elasticsearch.Net is a very low level, dependency free, client that has no opinions about how you build and represent your requests and responses. It has abstracted
enough so that all the Elasticsearch API endpoints are represented as methods but not too much to get in the way of how you want to build your json/request/response objects. It also comes with builtin, configurable/overridable, cluster failover retry mechanisms. Elasticsearch is elastic so why not your client?
NEST is a high level client that has the advantage of having mapped all the request and response objects, comes with a strongly typed query DSL that maps 1 to 1 with the Elasticsearch query DSL, and takes advantage of specific .NET features such as covariant results. NEST internally uses, and still exposes, the low level