... The tsearch2 module is available to add as an extension to the PostgreSQL database to allow for Full Text Indexing. This document is an introduction to installing, configuring, using and maintaining the database with the tsearch2 module activated. ... default | ... Because we have setup our default configuration to use the ISpell english dictionary, the words are lexized, and computer returns 2 lexems at the same position. 'compute':7 and 'computer':7 are now both indexed for the word computer. ...