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最近升级了Elasticsearch版本，从7.X升级到8.X的变化还是比较大的，原来7版本用的是RestHighLevelClient，8.X弃用RestHighLevelClient转而支持ElasticsearchClient，并且api调用方式经过建造者模式的改造，变成了链式调用。

因此为了更好地使用ElasticsearchClient的api操作Elasticsearch，封装了一个工具类，包含了常用的一些数据操作的方法。废话不多说直接上代码。。。

1、pom依赖

        <dependency><groupId>co.elastic.clients</groupId><artifactId>elasticsearch-java</artifactId><version>8.15.2</version></dependency><dependency><artifactId>elasticsearch-rest-client</artifactId><groupId>org.elasticsearch.client</groupId><version>8.15.2</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>2.0.30</version></dependency>

2、工具类代码

import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch._types.Result;
import co.elastic.clients.elasticsearch._types.SortOrder;
import co.elastic.clients.elasticsearch._types.Time;
import co.elastic.clients.elasticsearch._types.query_dsl.BoolQuery;
import co.elastic.clients.elasticsearch.core.*;
import co.elastic.clients.elasticsearch.core.bulk.BulkOperation;
import co.elastic.clients.elasticsearch.indices.AnalyzeRequest;
import co.elastic.clients.elasticsearch.indices.AnalyzeResponse;
import co.elastic.clients.elasticsearch.indices.CreateIndexResponse;
import co.elastic.clients.elasticsearch.indices.analyze.AnalyzeToken;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import java.io.IOException;
import java.io.StringReader;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;/*** Elasticsearch工具类* Elasticsearch版本：8.15.3*/
public class ElasticsearchJavaClient {private ElasticsearchClient client;/*** 构造方法，获取客户端（未开启认证）* @param httpUrls*/public ElasticsearchJavaClient(String[] httpUrls){HttpHost[] httpHosts = Arrays.stream(httpUrls).map(HttpHost::create).toArray(HttpHost[]::new);this.client = new ElasticsearchClient(new RestClientTransport(RestClient.builder(httpHosts).build(),new JacksonJsonpMapper()));}/*** 构造方法，获取客户端（开启认证，通过用户名密码进行认证并获取客户端）* @param httpUrls* @param username* @param password*/public ElasticsearchJavaClient(String[] httpUrls, String username, String password){HttpHost[] httpHosts = Arrays.stream(httpUrls).map(HttpHost::create).toArray(HttpHost[]::new);final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));RestClientBuilder builder = RestClient.builder(httpHosts);builder.setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {@Overridepublic HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpAsyncClientBuilder) {return httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider);}});this.client = new ElasticsearchClient(new RestClientTransport(builder.build(), new JacksonJsonpMapper()));}/*** 创建索引* @param indexName  索引名* @param numberOfShards  分片数* @param numberOfReplicas  副本数* @param mapping  mapping设计json字符串* @return*/public boolean createIndex(String indexName, Integer numberOfShards,Integer numberOfReplicas, String mapping) {CreateIndexResponse response = null;try {response = client.indices().create(builder -> builder.index(indexName).settings(b -> b.numberOfReplicas(numberOfReplicas.toString()).numberOfShards(numberOfShards.toString())).mappings(a -> a.withJson(new StringReader(mapping))));} catch (IOException e) {e.printStackTrace();} finally {client.shutdown();}return response.acknowledged();}/*** 删除索引* @param indexName  索引名* @return*/public boolean deleteIndex(String indexName) {try {return client.indices().delete(a -> a.index(indexName)).acknowledged();} catch (IOException e) {e.printStackTrace();} finally {client.shutdown();}return false;}/*** 判断索引是否已存在* @param indexName 索引名* @return*/public boolean indexExisit(String indexName) {try {return client.indices().exists(req -> req.index(indexName)).value();} catch (IOException e) {e.printStackTrace();} finally {client.shutdown();}return false;}/*** 由于数据落盘有默认的1秒延迟，刷新后使数据能被检索到* @param indexString*/public void refresh(String indexString){try {client.indices().refresh(req -> req.index(indexString));} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}}/*** 插入数据* @param indexName* @param data* @return*/public String insertData(String indexName, JSONObject data){try {IndexResponse response = client.index(a -> a.index(indexName).document(data));return response.id();} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return null;}/*** 根据索引和_id查询数据* @param indexName* @param id* @return*/public Map<String, Object> getDocById(String indexName, String id) {GetRequest request = GetRequest.of(g -> g.index(indexName).id(id));try {GetResponse<Map> response = client.get(request, Map.class);if(response.found()){return response.source();}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return null;}/*** 根据索引和_id查询数据* @param indexName* @param id* @return*/public JSONObject getDocInfoById(String indexName, String id) {GetRequest request = GetRequest.of(g -> g.index(indexName).id(id));try {GetResponse<JSONObject> response = client.get(request, JSONObject.class);if(response.found()){return response.source();}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return null;}/*** 根据索引和_id查询数据，并过滤掉无需返回的字段* @param indexName* @param id* @param excludes* @return*/public JSONObject getDocInfoById(String indexName, String id, String [] excludes) {GetRequest request = GetRequest.of(g -> g.index(indexName).id(id).sourceExcludes(Arrays.asList(excludes)));try {GetResponse<JSONObject> response = client.get(request, JSONObject.class);if(response.found()){return response.source();}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return null;}/*** 根据索引和_id查询数据，并过指定要返回的字段* @param indexName* @param id* @param includes* @return*/public JSONObject getDocInfoByIdWithIncludes(String indexName, String id, String [] includes) {GetRequest request = GetRequest.of(g -> g.index(indexName).id(id).sourceIncludes(Arrays.asList(includes)));try {GetResponse<JSONObject> response = client.get(request, JSONObject.class);if(response.found()){return response.source();}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return null;}/*** 判断数据是否存在* @param indexName* @param id* @return*/public boolean exists(String indexName, String id) {GetRequest request = GetRequest.of(g -> g.index(indexName).id(id));try {GetResponse<JSONObject> response = client.get(request, JSONObject.class);return response.found();} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return false;}/*** 根据索引和_id删除数据* @param indexName* @param id* @return*/public boolean deleteDocById(String indexName, String id) {DeleteRequest request = DeleteRequest.of(a -> a.index(indexName).id(id));try {DeleteResponse response = client.delete(request);if(response != null && response.result() != null){return Result.Deleted.jsonValue().equals(response.result().jsonValue());}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return false;}/*** 更新数据* @param indexName* @param id* @param newDoc* @return*/public boolean updateDocById(String indexName, String id, JSONObject newDoc) {UpdateRequest request = UpdateRequest.of(r -> r.id(id).index(indexName).doc(newDoc));request.refresh();try {UpdateResponse response = client.update(request, JSONObject.class);if(response != null && response.result() != null){return Result.Updated.jsonValue().equals(response.result().jsonValue());}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return false;}/*** 对输入的text使用analyzerName进行分词，返回分词后的词项* @param analyzerName* @param text* @return*/public List<AnalyzeToken> analyze(String analyzerName, String text){AnalyzeRequest analyzeRequest = new AnalyzeRequest.Builder().analyzer(analyzerName).text(text).build();AnalyzeResponse response = null;try {response = client.indices().analyze(analyzeRequest);} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return response.tokens();}/*** 批量删除* @param requestList* @return*/public boolean bulkDelete(List<DeleteRequest> requestList){List<BulkOperation> ops = requestList.stream().map(req -> BulkOperation.of(op -> op.delete(d -> d.id(req.id()).index(req.index())))).collect(Collectors.toList());try {BulkResponse response = client.bulk(r -> r.operations(ops));if(response != null ){return true;}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return false;}/*** 批量更新* @param requestList* @return*/public boolean bulkUpdate(List<UpdateRequest> requestList){List<BulkOperation> ops = requestList.stream().map(req -> BulkOperation.of(op -> op.update(d -> d.id(req.id()).index(req.index()).action(a -> a.doc(req.doc()))))).collect(Collectors.toList());try {BulkResponse response = client.bulk(r -> r.operations(ops));if(response != null ){return true;}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return false;}/*** 批量插入数据* @param requestList* @return*/public boolean bulkInsert(List<IndexRequest> requestList){List<BulkOperation> ops = requestList.stream().map(req -> BulkOperation.of(op -> op.index(i -> i.document(req.document()).index(req.index())))).collect(Collectors.toList());try {BulkResponse response = client.bulk(r -> r.operations(ops));if(response != null ){return true;}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return false;}/*** 通过脚本批量更新* @param index* @param query* @param script* @return*/public boolean updateByquery(String index, BoolQuery query, String script){try {UpdateByQueryResponse response = client.updateByQuery(q -> q.index(index).query(query._toQuery()).script(s -> s.source(script)));if(response != null ){return true;}} catch (IOException e) {e.printStackTrace();}finally {client.shutdown();}return false;}/*** 检索* @param indexName* @param pageNo* @param pageSize* @param sortField* @param sortOrder* @param boolQuery* @return*/public SearchResponse search(String indexName, Integer pageNo, Integer pageSize,String sortField, SortOrder sortOrder, BoolQuery boolQuery) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).from((pageNo - 1) * pageSize).size(pageSize).sort(s -> s.field(f -> f.field(sortField).order(sortOrder))).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}public SearchResponse search(String indexName, Integer pageNo, Integer pageSize,String sortField, SortOrder sortOrder, BoolQuery boolQuery, String[] excludes) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).source(a -> a.filter(f -> f.excludes(Arrays.asList(excludes)))).from((pageNo - 1) * pageSize).size(pageSize).sort(s -> s.field(f -> f.field(sortField).order(sortOrder))).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}public SearchResponse search(String indexName, Integer pageNo, Integer pageSize, BoolQuery boolQuery,String sortField, SortOrder sortOrder, String sortField2, SortOrder sortOrder2) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).from((pageNo - 1) * pageSize).size(pageSize).sort(s -> s.field(f -> f.field(sortField).order(sortOrder).field(sortField2).order(sortOrder2))).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}public SearchResponse search(String indexName, Integer pageNo, Integer pageSize, BoolQuery boolQuery,String sortField, SortOrder sortOrder, String sortField2, SortOrder sortOrder2,String[] excludes) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).source(a -> a.filter(f -> f.excludes(Arrays.asList(excludes)))).from((pageNo - 1) * pageSize).size(pageSize).sort(s -> s.field(f -> f.field(sortField).order(sortOrder).field(sortField2).order(sortOrder2))).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}public SearchResponse search(String indexName, Integer pageNo, Integer pageSize, BoolQuery boolQuery,String sortField, SortOrder sortOrder, String[] includes, String[] excludes) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).source(a -> a.filter(f -> f.excludes(Arrays.asList(excludes)).includes(Arrays.asList(includes)))).from((pageNo - 1) * pageSize).size(pageSize).sort(s -> s.field(f -> f.field(sortField).order(sortOrder))).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}public SearchResponse search(String indexName, Integer pageNo, Integer pageSize,  BoolQuery boolQuery,String sortField, SortOrder sortOrder, String time) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).from((pageNo - 1) * pageSize).size(pageSize).scroll(new Time.Builder().time(time).build()).sort(s -> s.field(f -> f.field(sortField).order(sortOrder))).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}/*** 查询符合条件的数据条数* @param indexName* @param boolQuery* @return*/public CountResponse count(String indexName, BoolQuery boolQuery) {try {return client.count(c -> c.index(indexName).query(q -> q.bool(boolQuery)));} catch (IOException e) {e.printStackTrace();}return null;}public SearchResponse search(String indexName, BoolQuery boolQuery) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}public SearchResponse search(String indexName, BoolQuery boolQuery, int size) {SearchRequest request = new SearchRequest.Builder().index(indexName).query(q -> q.bool(boolQuery)).size(size).build();SearchResponse response = null;try {response = client.search(request, JSONObject.class);} catch (IOException e) {e.printStackTrace();}return response;}
}

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