ElasticSearch 2.x java client 如何从SearchResponse中获取_routing

SearchRequestBuilder builder= client.prepareSearch(index).setTypes(type)

                .setSearchType(SearchType.DEFAULT).setFrom(from).setSize(size).setQuery(json);



        if(StringUtils.isNotEmpty(routing)){

            builder.setRouting(routing);

        }

for (String f : searchHit.getFields().keySet()) {



            if(f.equals("_routing")){

                return searchHit.getFields().get(f).getValue().toString();

            }