使用AggregationBuilders实现Elasticsearch Java API迁移表单TermsFacetBuilder

import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;

TermsAggregationBuilder aggregation = AggregationBuilders.terms("my_terms_aggregation").field("fieldName");

aggregation.size(10);  // 设置返回的桶数量
aggregation.order(Terms.Order.count(false));  // 按桶中文档数量降序排序

aggregation.subAggregation(AggregationBuilders.avg("avg_field").field("fieldName"));  // 添加平均值聚合操作

SearchResponse response = client.prepareSearch("indexName")
        .setTypes("typeName")
        .addAggregation(aggregation)
        .execute()
        .actionGet();

Terms terms = response.getAggregations().get("my_terms_aggregation");
for (Terms.Bucket bucket : terms.getBuckets()) {
    String key = bucket.getKeyAsString();
    long docCount = bucket.getDocCount();
    // 处理每个桶的结果
}