code: def _getStore(self):
          
          storeDir = self.store.newDirectory(self.indexDirectory)
          if not storeDir.exists():
              store = Store(storeDir)
              self._initStore(store)
              return store
          else:
              return Store(storeDir)
docs: Get the Store used for FTS.
  
          If it does not exist, it is created and initialised.