code: public HashMap<String, IndexInput> getIndexInputList() {
      HashMap<String, IndexInput> clonedIndexInputList = new HashMap<String, IndexInput>();
      for (Entry<String, IndexInput> entry : indexInputList.entrySet()) {
        clonedIndexInputList.put(entry.getKey(), entry.getValue().clone());
      }
      return clonedIndexInputList;
    }
docs: Gets the index input list.
  
  @return the index input list