SearchSourceBuilder

SearchSourceBuilder是Elasticsearch Java API中的一个类，用于构建搜索请求体，可以通过该类设置各种搜索条件，例如查询语句、过滤条件、排序规则、分页等等。SearchSourceBuilder可以通过以下方式创建：

SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

然后可以通过该对象设置各种搜索条件，例如：

searchSourceBuilder.query(QueryBuilders.matchQuery("title", "Elasticsearch"));

searchSourceBuilder.from(0);
searchSourceBuilder.size(10);

searchSourceBuilder.sort(new ScoreSortBuilder().order(SortOrder.DESC));
searchSourceBuilder.sort(new FieldSortBuilder("create_time").order(SortOrder.DESC));

最后将SearchSourceBuilder对象传递给SearchRequest对象即可发起搜索请求：

SearchRequest searchRequest = new SearchRequest("index_name");
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);