ES 2.4 java API search APIs

It can be executed across one or more indices and across one or more types.

SearchResponse response = client.prepareSearch("index1", "index2")        .setTypes("type1", "type2")        .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)        .setQuery(QueryBuilders.termQuery("multi", "test"))                 // Query        .setPostFilter(QueryBuilders.rangeQuery("age").from(12).to(18))     // Filter        .setFrom(0).setSize(60).setExplain(true)        .execute()        .actionGet();

滚动参数（通过搜索请求和每一个滚动的要求）告诉Elasticsearch多久应保持搜索中活着。它的价值（例如1m，看时间unitsedit）不需要足够长的时间来处理所有的数据 - 只需要足够长的时间来处理结果的前一批。每个滚动请求（带有滚动参数）设置一个新的到期时间。

通常，后台合并过程通过合并较小的段来创建新的更大的段，从而在较小的段被删除时优化索引。此过程在滚动过程中继续，但打开的搜索上下文防止旧段在仍在使用时被删除。这是怎样的Elasticsearch能够返回的初始搜索请求的结果，无论对文件的更改。

import static org.elasticsearch.index.query.QueryBuilders.*;QueryBuilder qb = termQuery("multi", "test");SearchResponse scrollResp = client.prepareSearch(test)        .addSort(SortParseElement.DOC_FIELD_NAME, SortOrder.ASC)        .setScroll(new TimeValue(60000))        .setQuery(qb)        .setSize(100).execute().actionGet(); //100 hits per shard will be returned for each scroll//Scroll until no hits are returnedwhile (true) {    for (SearchHit hit : scrollResp.getHits().getHits()) {        //Handle the hit...    }    scrollResp = client.prepareSearchScroll(scrollResp.getScrollId()).setScroll(new TimeValue(60000)).execute().actionGet();    //Break condition: No hits are returned    if (scrollResp.getHits().getHits().length == 0) {        break;    }}

Multi Search API

The multi search API allows to execute several search requests within the same API.

 

SearchRequestBuilder srb1 = client    .prepareSearch().setQuery(QueryBuilders.queryStringQuery("elasticsearch")).setSize(1);SearchRequestBuilder srb2 = client    .prepareSearch().setQuery(QueryBuilders.matchQuery("name", "kimchy")).setSize(1);MultiSearchResponse sr = client.prepareMultiSearch()        .add(srb1)        .add(srb2)        .execute().actionGet();// You will get all individual responses from MultiSearchResponse#getResponses()long nbHits = 0;for (MultiSearchResponse.Item item : sr.getResponses()) {    SearchResponse response = item.getResponse();    nbHits += response.getHits().getTotalHits();}

terminate after 执行多少条后结束,可以检验是否提前结束

SearchResponse sr = client.prepareSearch(INDEX)    .setTerminateAfter(1000)        .get();if (sr.isTerminatedEarly()) {    // We finished early}

aggregations 聚合

SearchResponse sr = client.prepareSearch()    .setQuery(QueryBuilders.matchAllQuery())    .addAggregation(            AggregationBuilders.terms("agg1").field("field")    )    .addAggregation(            AggregationBuilders.dateHistogram("agg2")                    .field("birth")                    .interval(DateHistogramInterval.YEAR)    )    .execute().actionGet();// Get your facet resultsTerms agg1 = sr.getAggregations().get("agg1");DateHistogram agg2 = sr.getAggregations().get("agg2");

The count API allows one to easily execute a query and get the number of matches for that query.

import static org.elasticsearch.index.query.QueryBuilders.*;CountResponse response = client.prepareCount("test")        .setQuery(termQuery("_type", "type1"))        .execute()        .actionGet();