/**
 * 从ES中查询数据
 * ES的时间如果不设置的话，默认是UTC时间，与北京时间相差8个小时，在查询统计的时候，如果不做统计的话，数据肯定是不准确的。
 *  ES版本：6.4.1。使用的javaApi是 Elasearch High Level Rest Client6.4
 * @param monthDate （patten:yyyy-MM）
 * @return List<SysCountResultVo> 统计结果。
 */
public List<SysCountResultVo> queryOrderCountDataFromEs(String monthDate) {
    try {
        /**
         * 条件查询（时间范围）
         */
        String startTime = DateUtil.getMonthFirstDay(DateUtil.dateStr2Date(monthDate + "-01", DateUtil.PATTERN_DTSHORTLINE));
        String endTime = DateUtil.getMonthLastDay(DateUtil.dateStr2Date(monthDate + "-01", DateUtil.PATTERN_DTSHORTLINE));
        Date s = DateUtil.dateStr2Date(startTime + " 00:00:00", DateUtil.PATTERN_SIMPLE);
        Date e = DateUtil.dateStr2Date(endTime + " 23:59:59", DateUtil.PATTERN_SIMPLE);
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        boolQuery.must(QueryBuilders.rangeQuery("order_time").gte(s).lte(e));
        searchSourceBuilder.query(boolQuery);
        /**
         * 分组聚合
         */
        TermsAggregationBuilder aggregationBuilder = AggregationBuilders.terms("orderStatusCount").field("order_status");
        aggregationBuilder.size(ESConstants.ES_AGG_SIZE);
        aggregationBuilder.collectMode(Aggregator.SubAggCollectionMode.BREADTH_FIRST);
        DateHistogramAggregationBuilder field = AggregationBuilders.dateHistogram("orderTime").field("order_time");
        /*
         *时间统计的时候，注意时差问题。统计的时候，设置时区即可，不需要设置偏移量。
         *offset偏移量这个参数，在某些时刻也是有用的，它可以自己定义一天的开始，比如设置从第一天的3点到第二天的3点为一天，默认都是从0点开始0点结束算做一天的
         */
        field.dateHistogramInterval(DateHistogramInterval.DAY).timeZone(DateTimeZone.getDefault());//.offset("+8h");
        aggregationBuilder.subAggregation(field);
        searchSourceBuilder.aggregation(aggregationBuilder);
        SearchResponse response = client.searchDocument(ESConstants.ES_EC_ORDER_INDEX, ESConstants.ES_EC_ORDER_TYPE, searchSourceBuilder);
        //结果处理
        Terms byPath = response.getAggregations().get("orderStatusCount");
        List<? extends Terms.Bucket> buckets = byPath.getBuckets();
        List<SysCountResultVo> resultVos = new ArrayList<>();
        for (Terms.Bucket bucket : buckets) {
            Histogram agg = bucket.getAggregations().get("orderTime");
            for (Histogram.Bucket entry : agg.getBuckets()) {
                SysCountResultVo sysCountVo = new SysCountResultVo();
                sysCountVo.setLocalPath(bucket.getKeyAsString());
                long t = ((DateTime)entry.getKey()).getMillis();
                Calendar cal = Calendar.getInstance();
                cal.setTimeInMillis(t);
                sysCountVo.setDimension(DateUtil.date2DateStr(cal.getTime(),DateUtil.PATTERN_SIMPLE));
                sysCountVo.setTimes(entry.getDocCount());
                resultVos.add(sysCountVo);
            }
        }
        return resultVos;
    } catch (Exception e) {
        logger.error(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>从ES中查询数据失败",e);
        return null;
    }
}