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Full-text Indexing and Searching
Lucene
Lucene integration with CouchDB is available with an external project called couchdb-lucene (http://github.com/rnewson/couchdb-lucene).
ElasticSearch
elasticsearch is an open source, distributed, RESTful, Search Engine.
ElasticSearch integration with CouchDB is possible by using an Elasticsearch couchdb river plugin
Links