... Tsearch2 - is the full text engine, fully integrated into PostgreSQL RDBMS. ... Headline support (text fragments with highlighted search terms) . ... Tsearch2, in a nutshell, provides FTS operator (contains) for the new data types, representing document ( tsvector ) and query ( tsquery ). ... OpenFTS uses tsearch2 as a storage and database engine as a query executor (searching). ... Even though tsearch v1 had many features of a search engine it lacked configuration support and relevance ranking. ...