@Override
    public Query rewrite(IndexReader reader) throws IOException {
      SolrRequestInfo info = SolrRequestInfo.getRequestInfo();

      CoreContainer container = info.getReq().getCore().getCoreDescriptor().getCoreContainer();

      final SolrCore fromCore = container.getCore(fromIndex);

      if (fromCore == null) {
        throw new SolrException(
            SolrException.ErrorCode.BAD_REQUEST, "Cross-core join: no such core " + fromIndex);
      }
      RefCounted<SolrIndexSearcher> fromHolder = null;
      fromHolder = fromCore.getRegisteredSearcher();
      final Query joinQuery;
      try {
        joinQuery =
            JoinUtil.createJoinQuery(
                fromField, true, toField, fromQuery, fromHolder.get(), scoreMode);
      } finally {
        fromCore.close();
        fromHolder.decref();
      }
      return joinQuery.rewrite(reader);
    }
 @Override
 public Query rewrite(IndexReader reader) throws IOException {
   SolrRequestInfo info = SolrRequestInfo.getRequestInfo();
   final Query jq =
       JoinUtil.createJoinQuery(
           fromField, true, toField, fromQuery, info.getReq().getSearcher(), scoreMode);
   return jq.rewrite(reader);
 }