Elasticsearch has very rich client library support to make it accessible to many programming languages. There are client libraries available for Java, C#, Python, JavaScript, PHP, Perl, Ruby, and many more. Apart from the official client libraries, there are community-driven libraries for 20 plus programming languages. 

Additionally, Elasticsearch has a very rich REST (Representational State Transfer) API, which works on the HTTP protocol. The REST API is very well documented and quite comprehensive, making all operations available over HTTP.

All this means that Elasticsearch is very easy to integrate into any application to fulfill your search and analytics needs.