for (String fromIndex : indexList) {
    SearchResponse rsp = client.prepareSearch(fromIndex).
            setQuery(QueryBuilders.matchAllQuery()).setSize(hitsPerPage).
            // This is important:
            setSearchType(SearchType.QUERY_AND_FETCH).
            setScroll(TimeValue.timeValueMinutes(30)).execute().actionGet();
    try {
        long total = rsp.hits().totalHits();
        Collection<MyTweet> tweets = collectTweets(rsp);
        bulkUpdate(tweets, intoIndex);
        int page = 1;
        int pages = (int) (total / hitsPerPage);
        if (total % hitsPerPage > 0)
            pages++;

        int collectedResults = 0;
        int currentResults;
        while ((currentResults = rsp.hits().hits().length) > 0) {
            collectedResults+=currentResults;
            rsp = client.prepareSearchScroll(rsp.scrollId()).
                    setScroll(TimeValue.timeValueMinutes(30)).execute().actionGet();
            tweets = collectTweets(rsp);
            bulkUpdate(tweets, intoIndex);
            logger.info("Progress " + page++ + "/"+ pages + " current=" + currentResults
                    + " total=" + total + " fromIndex=" + fromIndex);
        }
        logger.info("Finished copying of index:"+fromIndex+". Total:" + total + " collected:" + collectedResults);
    } catch (Exception ex) {
        logger.error("Failed to copy data from index " + fromIndex + " into " + intoIndex + ".", ex);
    }
}