correct approach to get fields value from an index

gistfile1.java

        float boost = (float) 1.0;
        int minimumNumberShouldMatch = 2;
        BoolQueryBuilder boolquery = new BoolQueryBuilder();
        QueryStringQueryBuilder customerqueryStringQueryBuilder = new QueryStringQueryBuilder(customerid).analyzer("mainsearchanalyzer");
        QueryStringQueryBuilder accountqueryStringQueryBuilder = new QueryStringQueryBuilder(secondaryMachingData).analyzer("mainsearchanalyzer");
        BoolQueryBuilder boolquery1 = boolquery.boost(boost).minimumNumberShouldMatch(minimumNumberShouldMatch).should(customerqueryStringQueryBuilder).should(accountqueryStringQueryBuilder);

        SearchResponse searchResponse = client.prepareSearch(masterIndexName).setSearchType(SearchType.DEFAULT).setTypes(customerExceptionIndexName).setQuery(boolquery1).execute().actionGet();

        logger.debug("searchResponse Object:: \n" + searchResponse);
        SearchHits sh = searchResponse.getHits();
        SearchHit[] hits = sh.hits();
        int length = hits.length;

 Map<String, Object> sourcesColumnkeyValuePair = new HashMap<String, Object>();
            //retriving key value pair in customExceptionlist
            for (int i = 0; i < length; i++) {
                Map<String, Object> sourceAsMap = hits[i].sourceAsMap();
                Iterator<String> iterator = sourceAsMap.keySet().iterator();
                while (iterator.hasNext()) {
                    String containerindexName = iterator.next();
                    sourcesColumnkeyValuePair = (Map) sourceAsMap.get(containerindexName);
                }
            }