code: protected void refreshIndexes(Set<String> set)
     {
        // do nothing if null is passed
        if (set == null)
        {
           return;
        }
        setNames(set);
        // callback multiIndex to refresh lists
        try
        {
           MultiIndex multiIndex = getMultiIndex();
           if (multiIndex != null)
           {
              multiIndex.refreshIndexList();
           }
        }
        catch (IOException e)
        {
           LOG.error("Failed to update indexes! " + e.getMessage(), e);
        }
     }
docs: Update index configuration, when it changes on persistent storage
  
  @param set