Nic has done a cool blog showing how to roll your own custom Typeahead feature on top of FTS:
https://blog.couchbase.com/developing-a-typeahead-with-couchbase-node-js-and-full-text-search/
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Another latest version here - https://blog.couchbase.com/building-autocomplete-or-typeahead-functionality-using-full-text-search/