es java聚合方法——按时间分组

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BoolQueryBuilder queryBuilder = QueryBuilders.boolQuery();
SimpleDateFormat simpleDateFormat1 = new SimpleDateFormat("yyyy-MM-dd");
Date parse1 = simpleDateFormat1.parse(startDate);
Date parse2 = simpleDateFormat1.parse(endDate);
queryBuilder.must(QueryBuilders.rangeQuery("createDate").gte(parse1.getTime()));
queryBuilder.must(QueryBuilders.rangeQuery("createDate").lte(parse2.getTime()));
//根据时间分组统计总数
DateHistogramAggregationBuilder fieldBuilder = AggregationBuilders.dateHistogram("createDate").field("createDate").dateHistogramInterval(DateHistogramInterval.MONTH);
ValueCountAggregationBuilder caseNumBuilder = AggregationBuilders.count("caseNum").field("id");
//分组查询拼接求各组数
SearchQuery searchQuery = new NativeSearchQueryBuilder()
        .withIndices(Constants.CASE_INFO)
        .withTypes(Constants.CASE_INFO)
        .withSearchType(SearchType.DEFAULT)
        .withQuery(queryBuilder)
        .addAggregation(fieldBuilder.subAggregation(caseNumBuilder)).build();
logger.info(searchQuery.toString());
Aggregations aggregations = elasticsearchTemplate.query(searchQuery, SearchResponse::getAggregations);
Map<String, Aggregation> aggregationMap = aggregations.asMap();
HomePageThreeResponse homePageThreeResponses = new HomePageThreeResponse();
Histogram count = (Histogram) aggregationMap.get("createDate");
List<Integer> caseCountList = new ArrayList<>();
List<String> dayList = new ArrayList<>();
for (Histogram.Bucket bucket : count.getBuckets()) {
    //设置有数据的时间
    String keyAsString = bucket.getKeyAsString();
    long lt = new Long(keyAsString);
    Date date = new Date(lt);
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    int month = c.get(Calendar.MONTH) + 1;
    dayList.add(String.valueOf(month));
    InternalValueCount caseNumCount = bucket.getAggregations().get("caseNum");
    Integer num = Integer.valueOf(Long.toString(caseNumCount.getValue()));
    caseCountList.add(num);
}