If you want to learn more about full-text search for Couchbase Server, here are some additional resources:
Couchconf Presentation on Full Text Search Integration.
The Learning Portal a proof-of-concept application which demonstrates Couchbase and Elasticsearch together. The full source is also available on GitHub at Couchbaselabs, Learning Portal.
Blog post and tutorial on Elasticsearch with Couchbase, from Couchbaselabs.
Elasticsearch Guide, which is particularly useful for developing more advanced queries, indexing a field more than one way, and to provide custom mappings which influence your search results.