elasticsearch API 集合

3.3.1 Preparing a query 准备查询请求

import org.elasticsearch.action.search.SearchResponse;import org.elasticsearch.client.Client;import org.elasticsearch.search.SearchHit;SearchResponse response = client.prepareSearch("library").addFields("title", "_source").execute().actionGet();for(SearchHit hit: response.getHits().getHits()) {     System.out.println(hit.getId());     if (hit.getFields().containsKey("title")) {            System.out.println("field.title: "+ hit.getFields().get("title").getValue());     }     System.out.println("source.title: " + hit.getSource().get("title"));}

 

3.3.2 Building queries 构造查询

import org.elasticsearch.index.query.QueryBuilder;import org.elasticsearch.index.query.QueryBuilders;

SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

searchSourceBuilder.query(QueryBuilders.termQuery("sid_s",text));

Search search = new Search.Builder(searchSourceBuilder.toString()).addIndex("webpage")

.build();

try {

SearchResult result = client.execute(search);

}catch(Exception e){

e.printStackTrace();

}

 

3.3.3 Using the match all documents query 匹配所有文档的查询

queryBuilder = QueryBuilders.matchAllQuery().boost(11f).normsField("title");

 

 

3.3.4 The match query 匹配查询

queryBuilder = QueryBuilders.matchQuery("message", "a quick brown fox").operator(Operator.AND).zeroTermsQuery(ZeroTermsQuery.ALL);

 

3.3.5 Using the geo shape query 地理位置查询

queryBuilder = QueryBuilders.geoShapeQuery("location",ShapeBuilder.newRectangle().topLeft(13, 53).bottomRight(14, 52).build());

 

3.3.6 Paging query 分页查询

SearchResponse response = client.prepareSearch("library").setQuery(QueryBuilders.matchAllQuery()).setFrom(10)   //跳过前10个文档.setSize(20)   //获取20个文档.execute().actionGet();

response.getHits().totalHits()可以统计当前匹配到的结果数

 

3.3.7 Sorting  排序

SearchResponse response = client.prepareSearch("library").setQuery(QueryBuilders.matchAllQuery()).addSort(SortBuilders.fieldSort("title")).addSort("_score", SortOrder.DESC).execute().actionGet()

SortBuilders.scriptSort(script, type) //使用脚本来实现排序

SortBuilders.geoDistanceSort(fieldName) //根据空间距离来进行排序

提到距离问题，附带一篇博文：关于已知两点经纬度求球面最短距离的公式推导

 

3.3.8 Filtering 过滤

 

Java代码  

1. QueryBuilder filterBuilder = QueryBuilders  
2.          .filteredQuery(  
3.               QueryBuilders.existsQuery("title").queryName("exist"),  
4.               QueryBuilders.termQuery("title", "elastic")  
5.           );  
6.   
7. SearchResponse response = client.prepareSearch("library")  
8.           .setPostFilter(filterBuilder)  
9.           .execute().actionGet();  

  

 

3.3.10 Highlighting 高亮

SearchResponse response = client.prepareSearch("wikipedia").addHighlightedField("title").setQuery(QueryBuilders.termQuery("title", "actress")).setHighlighterPreTags("<1>", "<2>").setHighlighterPostTags("</1>", "</2>").execute().actionGet();for(SearchHit hit: response.getHits().getHits()) {    HighlightField hField = hit.getHighlightFields().get("title");    for (Text t : hField.fragments()) {           System.out.println(t.string());    }}

 

3.3.11 Suggestions 查询建议

SearchResponse response = client.prepareSearch("wikipedia").setQuery(QueryBuilders.matchAllQuery()).addSuggestion(new TermSuggestionBuilder("first_suggestion").text("graphics designer").field("_all")).execute().actionGet();for( Entry<? extends Option> entry : response.getSuggest().getSuggestion("first_suggestion").getEntries()) {     System.out.println("Check for: " + entry.getText() + ". Options:");     for( Option option : entry.getOptions()) {          System.out.println("\t" + option.getText());     }}

 

 

3.3.12 Counting 统计

CountResponse response = client.prepareCount("library").setQuery(QueryBuilders.termQuery("title", "elastic")).execute().actionGet();

 

3.3.13 Scrolling 滚动

SearchResponse responseSearch = client.prepareSearch("library").setScroll("1m").setSearchType(SearchType.SCAN).execute().actionGet();String scrollId = responseSearch.getScrollId();SearchResponse response = client.prepareSearchScroll(scrollId).execute().actionGet();

 

3.3.14 Bulk 批量操作

BulkResponse response = client.prepareBulk().add(client.prepareIndex("library", "book", "5").setSource("{ \"title\" : \"Solr Cookbook\"}").request()).add(client.prepareDelete("library", "book", "2").request()).execute().actionGet();

 

 

3.3.16 Multi GET  多GET

MultiGetResponse response = client.prepareMultiGet().add("library", "book", "1", "2").execute().actionGet();

 

3.3.16 Multi Search 多搜索

MultiSearchResponse response = client.prepareMultiSearch().add(client.prepareSearch("library", "book").request()).add(client.prepareSearch("news")..setPostFilter(QueryBuilders.termQuery("tags", "important"))).execute().actionGet();

 

 

3.3.17 Building JSON queries and documents 构造JSON格式的查询和文档

IndexResponse response = client.prepareIndex("library", "book", "2").setSource("{ \"title\": \"Mastering ElasticSearch\"}").execute().actionGet();Map<String, Object> m = Maps.newHashMap();m.put("1", "Introduction");m.put("2", "Basics");m.put("3", "And the rest");XContentBuilder json = XContentFactory.jsonBuilder().prettyPrint().startObject().field("id").value("2123").field("lastCommentTime", new Date()).nullField("published").field("chapters").map(m).field("title", "Mastering ElasticSearch").array("tags", "search", "ElasticSearch", "nosql").field("values").startArray().value(1).value(10).endArray().endObject();

 

 

3.4 The administration API

 

3.4.1.1 The cluster and indices health API 集群和索引健康状态

ClusterHealthResponse response = client.admin().cluster().prepareHealth("library").execute().actionGet();

 

 

3.4.1.2 The cluster state API 集群状态

ClusterStateResponse response = client.admin().cluster().prepareState().execute().actionGet();

 

 

3.4.1.3 The update settings API 设置更新

Map<String, Object> map = Maps.newHashMap();map.put("indices.ttl.interval", "10m");ClusterUpdateSettingsResponse response = client.admin().cluster().prepareUpdateSettings().setTransientSettings(map).execute().actionGet();

 

3.4.1.4 The reroute API 重新路由

ClusterRerouteResponse response = client.admin().cluster().prepareReroute().setDryRun(true)   //阻止分配命令的运行，仅允许下面两个给定命令（move命令 + cacel命令）的执行.add(new MoveAllocationCommand(new ShardId("library", 3), "G3czOt4HQbKZT1RhpPCULw","PvHtEMuRSJ6rLJ27AW3U6w"),     new CancelAllocationCommand(new ShardId("library", 2), "G3czOt4HQbKZT1RhpPCULw",true)).execute().actionGet();

 

3.4.1.5 The nodes information API 节点信息

NodesInfoResponse response = client.admin().cluster().prepareNodesInfo().setHttp(true)  //响应中包括http信息.setPlugins(true)  //响应中包括插件信息.execute().actionGet();

 

3.4.1.6 The node statistics API 节点统计

NodesStatsResponse response = client.admin().cluster().prepareNodesStats().all().execute().actionGet();

 

3.4.1.7 The nodes hot threads API 节点热点线程

NodesHotThreadsResponse response = client.admin().cluster().prepareNodesHotThreads().execute().actionGet();

 

 

3.4.1.9 The search shards API 查询分片

//输出哪些节点将处理路由值为12的查询ClusterSearchShardsResponse response = client.admin().cluster().prepareSearchShards().setIndices("library").setRouting("12").execute().actionGet();

 

3.4.2 The Indices administration API

3.4.2.1 The index existence API 索引存在

IndicesExistsResponse response = client.admin().indices().prepareExists("books", "library").execute().actionGet();

 

3.4.2.2 The Type existence API 类型存在

TypesExistsResponse response = client.admin().indices().prepareTypesExists("library").setTypes("book").execute().actionGet();

 

3.4.2.3 The indices stats API 索引统计

IndicesStatsResponse response = client.admin().indices().prepareStats("library").all().execute().actionGet();

 

3.4.2.4 Index status 索引状态

IndicesStatsResponse response = client.admin().indices().prepareStatus("library").setRecovery(true).execute().actionGet();

 

 

3.4.2.5 Segments information API 索引段信息

IndicesSegmentResponse response = client.admin().indices().prepareSegments("library").execute().actionGet();

 

3.4.2.6 Creating an index API 创建索引

CreateIndexResponse response = client.admin().indices().prepareCreate("news").setSettings(Settings.settingsBuilder().put("number_of_shards", 1))  //分片数为1.addMapping("news", XContentFactory.jsonBuilder().startObject().startObject("news").startObject("properties").startObject("title").field("analyzer", "whitespace").field("type", "string").endObject().endObject().endObject().endObject()).execute().actionGet();

 

 

3.4.2.7 Deleting an index 删除索引

DeleteIndexResponse response = client.admin().indices().prepareDelete("news").execute().actionGet();

 

3.4.2.8 Closing an index 关闭索引

CloseIndexResponse response = client.admin().indices().prepareClose("library").execute().actionGet();

 

3.4.2.9 Opening an index 打开索引

OpenIndexResponse response = client.admin().indices().prepareOpen("library").execute().actionGet();

 

3.4.2.10 The Refresh API  刷新索引

RefreshResponse response = client.admin().indices().prepareRefresh("library").execute().actionGet();

 

3.4.2.11 The Flush API 清空缓冲区

FlushResponse response = client.admin().indices().prepareFlush("library").setFource(false).execute().actionGet();

 

3.4.2.12 The Optimize API 索引优化

OptimizeResponse response = client.admin().indices().prepareOptimize("library").setMaxNumSegments(2)  //最大索引段为2.setFlush(true).setOnlyExpungeDeletes(false).execute().actionGet();

 

3.4.2.13 The put mapping API 设置映射

PutMappingResponse response = client.admin().indices().preparePutMapping("news").setType("news").setSource(XContentFactory.jsonBuilder().startObject().startObject("news").startObject("properties").startObject("title").field("analyzer", "whitespace").field("type", "string").endObject().endObject().endObject().endObject()).execute().actionGet();

 

3.4.2.16 The aliases API 别名

IndicesAliasesResponse response = client.admin().indices().prepareAliases().addAlias("news", "n").addAlias("library", "elastic_books", QueryBuilders.termQuery("title", "elasticsearch")).removeAlias("news", "current_news") //移除news索引的别名current_news.execute().actionGet();

 

3.4.2.17 The get aliases API 获取别名

GetAliasesResponse response = client.admin().indices().prepareGetAliases("elastic_books", "n").execute().actionGet();

 

3.4.2.18 The aliases exists API 别名存在

AliasesExistResponse response = client.admin().indices().prepareAliasesExist("elastic*", "unknown")  //以elastic开头 || 为unknown 的别名.execute().actionGet();

 

3.4.2.19 The clear cache API 清空缓存

ClearIndicesCacheResponse response = client.admin().indices().prepareClearCache("library").setFieldDataCache(true).setFields("title")   //清空标题缓存.setQueryCache(true)  //清空过滤器缓存.execute().actionGet();

3.4.2.20 The update settings API  更新设置

UpdateSettingsResponse response = client.admin().indices().prepareUpdateSettings("library").setSettings(Settings.builder().put("index.number_of_replicas", 2))  //将副本数更新为2.execute().actionGet();

3.4.2.21 The analyze API 分析API

//主要是用来检查在library索引中使用whitespace分词器 + nGram过滤器处理“ElasticSerch Servers”短语的分析处理AnalyzeResponse response = client.admin().indices().prepareAnalyze("library", "ElasticSearch Servers").setTokenizer("whitespace").setTokenFilters("nGram").execute().actionGet();

 

3.4.2.22 The put template API 设置模板

1. PutIndexTemplateResponse response = client.admin().indices().preparePutTemplate("my_template")  //my_template模板名称.setTemplate("product*")   //可以被任何以product开头的索引使用.setSettings(Settings.builder().put("index.number_of_replicas", 2)  //2个副本.put("index.number_of_shards", 1))   //一个分片.addMapping("item", XContentFactory.jsonBuilder().startObject().startObject("item").startObject("properties").startObject("title").field("type", "string").endObject().endObject().endObject().endObject()).execute().actionGet();

    

    

3.4.2.23 The delete template API 删除模板

DeleteIndexTemplateResponse response = client.admin().indices().prepareDeleteTemplate("my_*") //删除以my_开头的模板.execute().actionGet();