分布式搜索Elasticsearch——删除指定索引

      删除索引的方式很多，这里列举三种。

      第一种是指定index、type、id执行删除，示例代码如下：

/** * @author Geloin */package com.gsoft.gsearch.util;import org.elasticsearch.action.get.GetResponse;import org.junit.Test;import com.gsoft.gsearch.BaseTest;import com.gsoft.gsearch.entity.Person;/** * @author Geloin *  */public class DeleteTest extends BaseTest {@Testpublic void delete() {try {String id = "1234567890";Person p = new Person();p.setId(id);p.setAge(20);p.setIsStudent(false);p.setSex("男");p.setName("张三的车");String source = ElasticSearchUtil.BeanToJson(p);// 创建索引client.prepareIndex(index, type, id).setSource(source).execute();System.out.println("休息6秒钟，以便创建索引");Thread.sleep(6000);// GetSystem.out.println("================================第一次Get");showById(id);client.prepareDelete(index, type, id).execute();System.out.println("休息6秒钟，以便删除索引");Thread.sleep(6000);System.out.println("================================第二次Get");showById(id);} catch (Exception e) {e.printStackTrace();} finally {if (null != client) {client.close();}if (null != node) {node.close();}}}/** * 根据ID查询，使用Get *  * @author Geloin * @param id * @throws Exception */private void showById(String id) throws Exception {GetResponse response = client.prepareGet(index, type, id).execute().actionGet();String json = response.getSourceAsString();if (null != json) {Person newPerson = mapper.readValue(json, Person.class);System.out.println("id\t\t" + newPerson.getId());System.out.println("name\t\t" + newPerson.getName());System.out.println("sex\t\t" + newPerson.getSex());System.out.println("age\t\t" + newPerson.getAge());System.out.println("isStudent\t\t" + newPerson.getIsStudent());} else {log.info("未查询到任何结果！");}}}

        第二种则使用Bulk执行批量操作，代码如下所示：

/** * @author Geloin */package com.gsoft.gsearch.util;import org.elasticsearch.action.bulk.BulkRequestBuilder;import org.elasticsearch.action.search.SearchResponse;import org.elasticsearch.index.query.QueryBuilder;import org.elasticsearch.index.query.QueryBuilders;import org.elasticsearch.search.SearchHit;import org.elasticsearch.search.SearchHits;import org.junit.Test;import com.gsoft.gsearch.BaseTest;import com.gsoft.gsearch.entity.Person;/** * @author Geloin *  */public class BulkDeleteTest extends BaseTest {@Testpublic void delete() {try {String id = "1234567890";BulkRequestBuilder builder1 = client.prepareBulk();for (int i = 0; i < 5; i++) {String myId = id + "_" + i;Person p = new Person();p.setId(myId);p.setAge(20);p.setIsStudent(false);p.setSex("男");p.setName("张三的车");String source = ElasticSearchUtil.BeanToJson(p);// 创建索引builder1.add(client.prepareIndex(index, type, myId).setSource(source).request());}builder1.execute();System.out.println("休息6秒钟，以便创建索引");Thread.sleep(6000);// GetSystem.out.println("================================第一次查询");query();BulkRequestBuilder builder = client.prepareBulk();for (int i = 0; i < 5; i++) {String myId = id + "_" + i;builder.add(client.prepareDelete(index, type, myId).request());}builder.execute();System.out.println("休息6秒钟，以便删除索引");Thread.sleep(6000);System.out.println("================================第二次查询");query();} catch (Exception e) {e.printStackTrace();} finally {if (null != client) {client.close();}if (null != node) {node.close();}}}private void query() throws Exception {// 检索QueryBuilder qb = QueryBuilders.matchPhraseQuery("name", "张三的车");SearchResponse searchResponse = client.prepareSearch(index).setTypes(type).setQuery(qb).setFrom(0).setSize(12).execute().actionGet();SearchHits hits = searchResponse.getHits();if (null == hits || hits.totalHits() == 0) {log.error("使用\"张三的车\"没有查询到任何结果！");} else {for (SearchHit hit : hits) {String json = hit.getSourceAsString();Person newPerson = mapper.readValue(json, Person.class);System.out.println("id\t\t" + newPerson.getId());System.out.println("name\t\t" + newPerson.getName());System.out.println("sex\t\t" + newPerson.getSex());System.out.println("age\t\t" + newPerson.getAge());System.out.println("isStudent\t\t" + newPerson.getIsStudent());System.out.println("+++++++++++++++++++++++++++++++++++++++++++++++++++");}}}}

        第一二种方案，要求你先知道要删除的索引的ID后，方可执行删除，这种方案的局限性较大。

        第三种方案则较简单，即根据条件删除匹配的索引，如下所示：

QueryBuilder qb = QueryBuilders.matchAllQuery();client.prepareDeleteByQuery(indeices).setQuery(qb).execute();