code: public void updateOfflineIndexes(long waitTime) {
  
          if ((m_offlineIndexThread != null) && m_offlineIndexThread.isAlive()) {
              // notify existing thread of update frequency change
              if (LOG.isDebugEnabled()) {
                  LOG.debug(Messages.get().getBundle().key(Messages.LOG_OI_UPDATE_INTERRUPT_0));
              }
              m_offlineIndexThread.interrupt();
              if (waitTime > 0) {
                  m_offlineIndexThread.getWaitHandle().enter(waitTime);
              }
          }
      }
docs: Updates all offline indexes.<p>
  
  Can be used to force an index update when it's not convenient to wait until the
  offline update interval has eclipsed.<p>
  
  Since the offline index will still need some time to update the new resources even if it runs directly,
  a wait time of 2500 or so should be given in order to make sure the index finished updating.
  
  @param waitTime milliseconds to wait after the offline update index was notified of the changes