elasticsearch aggregation sample by java. simple group by.

es_agg_simple.java

/*
ES Aggregation to get result same as result from this SQL
SELECT  
fieldA, COUNT(fieldA), SUM(fieldB), AVG(fieldB) 
from table   
group by fieldA;
*/
//検索クエリの発行
SearchRequestBuilder searchReq = client.prepareSearch("sample_index");
searchReq.setTypes("sample_types");

//size()で取得する結果の件数を指定できる
TermsBuilder termsb = AggregationBuilders.terms("my_fieldA").field("fieldA").size(100);
termsb.subAggregation(AggregationBuilders.sum("my_sum_fieldB").field("fieldB"));
termsb.subAggregation(AggregationBuilders.avg("my_avg_fieldB").field("fieldB"));

searchReq.setQuery(QueryBuilders.matchAllQuery()).addAggregation(termsb);
SearchResponse searchRes = searchReq.execute().actionGet();

//結果の取得
Terms fieldATerms = searchRes.getAggregations().get("my_fieldA");
for (Terms.Bucket filedABucket : fieldATerms.getBuckets()) {
	//fieldA
	String fieldAValue = filedABucket.getKey();
	
	//COUNT(fieldA)
	long fieldACount = filedABucket.getDocCount();
	
	//SUM(fieldB)
	Sum sumagg = filedABucket.getAggregations().get("my_sum_fieldB");
	long sumFieldB = (long)sumagg.getValues();
	
	//AVG(fieldB)
	Avg avgagg = filedABucket.getAggregations().get("my_avg_fieldB");
	double avgFieldB = avgagg.getValues();
}

If the aggregation result is largest, i want to scroll the aggregation result ,how to do ?