ElasticSearch reindex by JAVA API

package elasticsearch.importdata;

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;

public class ESBulkDataApi {

    public static void main(String[] args) {
        // establish the client
        Settings settings = ImmutableSettings.settingsBuilder()
                .put("cluster.name", "genbank").build();
        @SuppressWarnings("resource")
        Client client = new TransportClient(settings)
                .addTransportAddress(new InetSocketTransportAddress(
                        "10.0.26.1", 9300));
        QueryBuilder queryBuilder = QueryBuilders.boolQuery().must(
                QueryBuilders.matchAllQuery());

        SearchResponse searchResponse = client.prepareSearch("liu")
                .setTypes("seqs").setSearchType(SearchType.SCAN)
                .setScroll(new TimeValue(60000)).setQuery(queryBuilder)
                .setSize(100).execute().actionGet();

        //scroll to get the data
        while (true) {

            searchResponse = client
                    .prepareSearchScroll(searchResponse.getScrollId())
                    .setScroll(new TimeValue(600000)).execute().actionGet();


            for (SearchHit hit : searchResponse.getHits().getHits()) {
                // copy the data to the new index

                client.prepareIndex("my_index_v1", "seqs", hit.getId())
                        .setSource(hit.getSourceAsString()).execute().actionGet();
            }

            // when there is no data,break the loop
            if (searchResponse.getHits().getHits().length == 0) {
                break;
            }

        }
    }

}