【工作笔记】ElasticSearch从零开始学（五）—— Java_SearchAPI

es允许执行搜索查询，返回结果匹配（hits)，甚至跨多个index和执行多个type

SearchSourceBuilder

1. 所有参数都是可选的

import org.elasticsearch.action.search.SearchResponse;import org.elasticsearch.action.search.SearchType;import org.elasticsearch.index.query.QueryBuilders.*;

SearchResponse response = client.prepareSearch("index1", "index2") //索引        .setTypes("type1", "type2") //类型        //检索方式        .setSearchType(SearchType.DFS_QUERY_THEN_FETCH)        //查询条件query_string        .setQuery(QueryBuilders.termQuery("multi", "test"))              //多条件过滤filters                    .setPostFilter(          QueryBuilders.rangeQuery("age").from(12).to(20)         )        .setFrom(0)        .setSize(60)        .setExplain(true)        .get();

SearchAPI参考

Scrollings in Java

返回整个”page”, 用来检索大量结果

import static org.elasticsearch.index.query.QueryBuilders.*;//queryStringQueryBuilder qb = termQuery("multi", "test");SearchResponse scrollResp = client.prepareSearch(test)        .addSort(FieldSortBuilder.DOC_FIELD_NAME, SortOrder.ASC) //属性排序        .setScroll(new TimeValue(60000))         .setQuery(qb) //条件        .setSize(100) //每一页返回100条数据        .get(); //接收scrollResp响应结果do {    for (SearchHit hit : scrollResp.getHits().getHits()) {        //输出结果（封装在hits属性中)    }    scrollResp = client.          prepareSearchScroll(scrollResp.getScrollId())                          .setScroll(new TimeValue(60000))                          .execute()                          .actionGet();} while(scrollResp.getHits().getHits().length != 0);//遍历

从滚动请求返回的结果反映出当时的状态指数,最初的搜索请求,就像一个快照。索引、更新或删除只会影响以后的搜索请求

Scroll参考API

MultSearch

多个搜索API允许在相同API下执行多个搜索请求

请求格式大致如下

header\n //包括 index / indices 、 typebody\n //包括典型搜索查询（查询、聚合、大小等）header\n body\n

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)                    .get();            // 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();                for(SearchHit hit : response.getHits()){                    System.out.println(hit.getSourceAsString());                }}

multSearchAPI参考

聚合

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

AssociateAPI参考

Search Template

达到查询最大文档数量，提前终止

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

搜索模板

Map<String, Object> template_params = new HashMap<>();template_params.put("param_gender", "male");

创建模板请求

SearchResponse sr = new SearchTemplateRequestBuilder(client)    .setScript("template_gender")                     .setScriptType(ScriptService.ScriptType.FILE)     .setScriptParams(template_params)                 .setRequest(new SearchRequest())                  .get()                                            .getResponse();                               

在集群中存储模板状态

client.admin().cluster().preparePutStoredScript()    .setScriptLang("mustache")    .setId("template_gender")    .setSource(new BytesArray(        "{\n" +        "    \"template\" : {\n" +        "        \"query\" : {\n" +        "            \"match\" : {\n" +        "                \"gender\" : \"{{param_gender}}\"\n" +        "            }\n" +        "        }\n" +        "    }\n" +        "}")).get();

执行存储模板

SearchResponse sr = new SearchTemplateRequestBuilder(client)        .setScript("template_gender")                               .setScriptType(ScriptType.STORED)             .setScriptParams(template_params)                           .setRequest(new SearchRequest())                            .get()                                                      .getResponse();                                     

内联模板

sr = new SearchTemplateRequestBuilder(client)        .setScript("{\n" +                                                  "        \"query\" : {\n" +                "            \"match\" : {\n" +                "                \"gender\" : \"{{param_gender}}\"\n" +                "            }\n" +                "        }\n" +                "}")        .setScriptType(ScriptType.INLINE)            .setScriptParams(template_params)                          .setRequest(new SearchRequest())                           .get()                                                     .getResponse();                                    

更多模板参考