* @return an index reader for this search index.
* @throws IOException the index reader cannot be obtained.
*/
protected IndexReader getIndexReader(boolean includeSystemIndex)
throws IOException {
QueryHandler parentHandler = getContext().getParentHandler();
CachingMultiIndexReader parentReader = null;
if (parentHandler instanceof SearchIndex && includeSystemIndex) {
parentReader = ((SearchIndex) parentHandler).index.getIndexReader();
}