code: public void initOfflineIndexes() {
  
          // check which indexes are configured as offline indexes
          List<I_CmsSearchIndex> offlineIndexes = new ArrayList<I_CmsSearchIndex>();
          Iterator<I_CmsSearchIndex> i = m_indexes.iterator();
          while (i.hasNext()) {
              I_CmsSearchIndex index = i.next();
              if (I_CmsSearchIndex.REBUILD_MODE_OFFLINE.equals(index.getRebuildMode())) {
                  // this is an offline index
                  offlineIndexes.add(index);
              }
          }
          m_offlineIndexes = offlineIndexes;
          m_offlineHandler.initialize();
  
      }
docs: Initialize the offline index handler, require after an offline index has been added.<p>