question: public void test_historyIndexDisabled ( ) throws SailException { final Properties properties = getProperties ( ) ; properties . setProperty ( com . bigdata . rdf . store . AbstractTripleStore . Options . HISTORY_SERVICE , "false" ) ; final BigdataSail sail = getSail ( properties ) ; try { sail . initialize ( ) ; final BigdataSailConnection conn = sail . getConnection ( ) ; try { final IIndex ndx = getHistoryIndex ( conn . getTripleStore ( ) ) ; assertNull ( ndx ) ; conn . rollback ( ) ; } finally { conn . close ( ) ; } } finally { sail . __tearDownUnitTest ( ) ; } }
target:  Unit test verifies that the history index is not created if the option is not enabled.