API extension plugins

API extension plugins add new functionality to Elasticsearch by adding new APIs or features, usually to do with search or mapping.

A number of plugins have been contributed by our community:

• carrot2 Plugin: Results clustering with carrot2 (by Dawid Weiss)
• Elasticsearch Trigram Accelerated Regular Expression Filter: (by Wikimedia Foundation/Nik Everett)
• Elasticsearch Experimental Highlighter: (by Wikimedia Foundation/Nik Everett)
• Entity Resolution Plugin (zentity): Real-time entity resolution with pure Elasticsearch (by Dave Moore)