文章目录

• 一. ES8 的Java API 环境准备
• 二. ES8 的Java API 索引操作
• 三. ES8 的Java API 文档操作
• • 1. 文档的 插入 批量插入 删除等操作
  • 2. 文档的查询
• 四、异步客户端操作

一. ES8 的Java API 环境准备

ES8 废除了Type的概念。为了适应这种数据结构的改变，ES官方从1.7版本开始建议使用新的Elasticsearch Java Client。

搭建maven环境：

888.6.2
org.elasticsearch.pluginx-pack-sql-jdbc8.6.2co.elastic.clientselasticsearch-java${elastic.version}com.fasterxml.jackson.corejackson-databind2.12.3jakarta.jsonjakarta.json-api2.0.1

获取客户端对象：

因为，服务注册的是基于https的安全elasticsearch服务认证，所以，将之前的证书进行一个转换：

# 生成es-api-ca.crt证书，之前没有密码设置。
openssl pkcs12 -in elastic-stack-ca.p12 -clcerts -nokeys -out es-api-ca.crt

将生成的证书放到项目里面。

创建连接对象：

package com.itholmes.elasticsearch.api;import co.elastic.clients.elasticsearch.ElasticsearchAsyncClient;
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;import javax.net.ssl.SSLContext;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;public class ESClient {public static void main(String[] args) throws Exception{// 初始化ES服务器的连接initESConnection();}public static void initESConnection() throws Exception{final BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();// 声明ES当前登录的账号密码credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials("elastic","3j=JYpywv=jMtQB+XIXS"));// 证书的路径Path caCertificatePath = Paths.get("E:\\itholmes\\demo\\itholmes-es8\\certs\\es-api-ca.crt");// x.509 , pkcs12都是 证书的算法CertificateFactory factory = CertificateFactory.getInstance("x.509");Certificate trustedCa;try (InputStream is = Files.newInputStream(caCertificatePath)){trustedCa = factory.generateCertificate(is);}KeyStore trustStore = KeyStore.getInstance("pkcs12");trustStore.load(null,null);trustStore.setCertificateEntry("ca",trustedCa);SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial(trustStore,null);SSLContext sslContext = sslContextBuilder.build();RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.43.133", 9200, "https")).setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {@Overridepublic HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {return httpClientBuilder.setSSLContext(sslContext).setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).setDefaultCredentialsProvider(credentialsProvider);}});// 创建客户端RestClient restClient = builder.build();// 通过客户端，创建传输对象RestClientTransport transport = new RestClientTransport(restClient, new JacksonJsonpMapper());// 同步客户端对象ElasticsearchClient client = new ElasticsearchClient(transport);// 异步客户端对象ElasticsearchAsyncClient asyncClient = new ElasticsearchAsyncClient(transport);// fixme 同步是需要关闭的，而异步是不需要关闭的。transport.close();}}

二. ES8 的Java API 索引操作

ES Java的API相关操作：

• 采用构造器形式来创建所需要的对象。
• 通过lambda来创建。

对象形式操作：

package com.itholmes.elasticsearch.api;import co.elastic.clients.elasticsearch.ElasticsearchAsyncClient;
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch.indices.*;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import javax.net.ssl.SSLContext;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;public class ESClient {private static ElasticsearchClient client;private static ElasticsearchAsyncClient asyncClient;private static ElasticsearchTransport transport;public static final String INDEX_HOLMES = "itholmes";public static void main(String[] args) throws Exception{// 初始化ES服务器的连接initESConnection();// 操作索引operationIndex();}// 操作索引private static void operationIndex() throws Exception{// 获取索引客户端对象ElasticsearchIndicesClient indices = client.indices();// 判断索引是否存在ExistsRequest existsRequest = new ExistsRequest.Builder().index(INDEX_HOLMES).build();final boolean flg = indices.exists(existsRequest).value();if (flg){System.out.println("索引" + INDEX_HOLMES + "已经存在！");} else {// 创建索引// CreateIndexRequest构造方法已经私有化了，所以需要采用构建器方式来构建对象。ES的API对象基本上都采用构建器的方式创建对象。CreateIndexRequest request = new CreateIndexRequest.Builder().index(INDEX_HOLMES).build();final CreateIndexResponse createIndexResponse = indices.create(request);System.out.println("创建索引的响应对象" + createIndexResponse);}// 查询索引GetIndexRequest getIndexRequest = new GetIndexRequest.Builder().index(INDEX_HOLMES).build();final GetIndexResponse getIndexResponse = indices.get(getIndexRequest);// IndexState itholmes = getIndexResponse.get("itholmes");System.out.println("查询的响应结果：" + getIndexResponse);// 删除索引DeleteIndexRequest deleteIndexRequest = new DeleteIndexRequest.Builder().index(INDEX_HOLMES).build();DeleteIndexResponse delete = indices.delete(deleteIndexRequest);System.out.println("索引删除成功：" + delete);// fixme 同步是需要关闭的，而异步是不需要关闭的。transport.close();}public static void initESConnection() throws Exception{final BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();// 声明ES当前登录的账号密码credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials("elastic","3j=JYpywv=jMtQB+XIXS"));// 证书的路径Path caCertificatePath = Paths.get("E:\\itholmes\\demo\\itholmes-es8\\certs\\es-api-ca.crt");// x.509 , pkcs12都是 证书的算法CertificateFactory factory = CertificateFactory.getInstance("x.509");Certificate trustedCa;try (InputStream is = Files.newInputStream(caCertificatePath)){trustedCa = factory.generateCertificate(is);}KeyStore trustStore = KeyStore.getInstance("pkcs12");trustStore.load(null,null);trustStore.setCertificateEntry("ca",trustedCa);SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial(trustStore,null);SSLContext sslContext = sslContextBuilder.build();RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.43.133", 9200, "https")).setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {@Overridepublic HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {return httpClientBuilder.setSSLContext(sslContext).setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).setDefaultCredentialsProvider(credentialsProvider);}});// 创建客户端RestClient restClient = builder.build();// 通过客户端，创建传输对象transport = new RestClientTransport(restClient, new JacksonJsonpMapper());// 同步客户端对象client = new ElasticsearchClient(transport);// 异步客户端对象asyncClient = new ElasticsearchAsyncClient(transport);}}

lambda方式创建索引：（推荐使用，代码简洁）

package com.itholmes.elasticsearch.api;import co.elastic.clients.elasticsearch.ElasticsearchAsyncClient;
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch.indices.*;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import co.elastic.clients.util.ObjectBuilder;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import javax.net.ssl.SSLContext;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.function.Function;public class ESClient {private static ElasticsearchClient client;private static ElasticsearchAsyncClient asyncClient;private static ElasticsearchTransport transport;public static final String INDEX_HOLMES = "itholmes";public static void main(String[] args) throws Exception{// 初始化ES服务器的连接initESConnection();// lambda方式 操作索引operationIndexLambda();}// fixme 操作索引 Lambda方式 其实就是提供了两种方式private static void operationIndexLambda() throws Exception{// 获取索引客户端对象ElasticsearchIndicesClient indices = client.indices();// 检查索引是否存在boolean flg = indices.exists(req -> req.index(INDEX_HOLMES)).value();if (flg){System.out.println("索引" + INDEX_HOLMES + "已经存在！");} else {// 创建索引final CreateIndexResponse createIndexResponse = indices.create(req -> req.index(INDEX_HOLMES));System.out.println("创建索引的响应对象：" + createIndexResponse);}// 查询索引final GetIndexResponse getIndexResponse = indices.get(req -> req.index(INDEX_HOLMES));System.out.println("查询的响应结果：" + getIndexResponse.get("itholmes"));// 删除索引DeleteIndexResponse deleteIndexResponse = indices.delete(req -> req.index(INDEX_HOLMES));System.out.println("索引删除成功：" + deleteIndexResponse);// fixme 同步是需要关闭的，而异步是不需要关闭的。transport.close();}// 初始化ES服务器的连接public static void initESConnection() throws Exception{final BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();// 声明ES当前登录的账号密码credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials("elastic","3j=JYpywv=jMtQB+XIXS"));// 证书的路径Path caCertificatePath = Paths.get("E:\\itholmes\\demo\\itholmes-es8\\certs\\es-api-ca.crt");// x.509 , pkcs12都是 证书的算法CertificateFactory factory = CertificateFactory.getInstance("x.509");Certificate trustedCa;try (InputStream is = Files.newInputStream(caCertificatePath)){trustedCa = factory.generateCertificate(is);}KeyStore trustStore = KeyStore.getInstance("pkcs12");trustStore.load(null,null);trustStore.setCertificateEntry("ca",trustedCa);SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial(trustStore,null);SSLContext sslContext = sslContextBuilder.build();RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.43.133", 9200, "https")).setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {@Overridepublic HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {return httpClientBuilder.setSSLContext(sslContext).setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).setDefaultCredentialsProvider(credentialsProvider);}});// 创建客户端RestClient restClient = builder.build();// 通过客户端，创建传输对象transport = new RestClientTransport(restClient, new JacksonJsonpMapper());// 同步客户端对象client = new ElasticsearchClient(transport);// 异步客户端对象asyncClient = new ElasticsearchAsyncClient(transport);}}

三. ES8 的Java API 文档操作

1. 文档的 插入 批量插入 删除等操作

文档对象形式操作：

package com.itholmes.elasticsearch.api;import co.elastic.clients.elasticsearch.ElasticsearchAsyncClient;
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch._types.Result;
import co.elastic.clients.elasticsearch.core.*;
import co.elastic.clients.elasticsearch.core.bulk.BulkOperation;
import co.elastic.clients.elasticsearch.core.bulk.CreateOperation;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;import javax.net.ssl.SSLContext;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.List;public class ESClient2 {private static ElasticsearchClient client;private static ElasticsearchAsyncClient asyncClient;private static ElasticsearchTransport transport;public static final String INDEX_HOLMES = "itholmes";public static void main(String[] args) throws Exception{// 初始化ES服务器的连接initESConnection();// fixme 文档操作operateDocument();}// 对象操作文档public static void operateDocument() throws Exception{// 创建对象数据User user = new User();user.setId(1001);user.setName("zhangsan");user.setAge(30);CreateRequest createRequest = new CreateRequest.Builder().index(INDEX_HOLMES).id("1001").document(user).build();// 增加文档CreateResponse createResponse = client.create(createRequest);System.out.println("文档创建的响应对象：" + createResponse);// 批量添加数据List opts = new ArrayList<>();for (int i = 0; i < 5; i++) {CreateOperation optObj = new CreateOperation.Builder().index(INDEX_HOLMES).id("200" + i).document(new User(2000 + i,"张三" + i,30 + i)).build();BulkOperation opt = new BulkOperation.Builder().create(optObj).build();opts.add(opt);}BulkRequest bulkRequest = new BulkRequest.Builder().operations(opts).build();final BulkResponse bulk = client.bulk(bulkRequest);System.out.println("批量新增数据的响应：" + bulk);// 文档删除DeleteRequest deleteRequest = new DeleteRequest.Builder().index(INDEX_HOLMES).id("2001").build();DeleteResponse delete = client.delete(deleteRequest);System.out.println("删除后的响应：" + delete);// 关闭transporttransport.close();}// 初始化ES服务器的连接public static void initESConnection() throws Exception{final BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();// 声明ES当前登录的账号密码credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials("elastic","3j=JYpywv=jMtQB+XIXS"));// 证书的路径Path caCertificatePath = Paths.get("E:\\itholmes\\demo\\itholmes-es8\\certs\\es-api-ca.crt");// x.509 , pkcs12都是 证书的算法CertificateFactory factory = CertificateFactory.getInstance("x.509");Certificate trustedCa;try (InputStream is = Files.newInputStream(caCertificatePath)){trustedCa = factory.generateCertificate(is);}KeyStore trustStore = KeyStore.getInstance("pkcs12");trustStore.load(null,null);trustStore.setCertificateEntry("ca",trustedCa);SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial(trustStore,null);SSLContext sslContext = sslContextBuilder.build();RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.43.133", 9200, "https")).setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {@Overridepublic HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {return httpClientBuilder.setSSLContext(sslContext).setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).setDefaultCredentialsProvider(credentialsProvider);}});// 创建客户端RestClient restClient = builder.build();// 通过客户端，创建传输对象transport = new RestClientTransport(restClient, new JacksonJsonpMapper());// 同步客户端对象client = new ElasticsearchClient(transport);// 异步客户端对象asyncClient = new ElasticsearchAsyncClient(transport);}}

lambda形式：

package com.itholmes.elasticsearch.api;import co.elastic.clients.elasticsearch.ElasticsearchAsyncClient;
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch._types.Result;
import co.elastic.clients.elasticsearch.core.*;
import co.elastic.clients.elasticsearch.core.bulk.BulkOperation;
import co.elastic.clients.elasticsearch.core.bulk.CreateOperation;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;import javax.net.ssl.SSLContext;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.List;public class ESClient2 {private static ElasticsearchClient client;private static ElasticsearchAsyncClient asyncClient;private static ElasticsearchTransport transport;public static final String INDEX_HOLMES = "itholmes";public static void main(String[] args) throws Exception{// 初始化ES服务器的连接initESConnection();// fixme 文档操作operateDocumentLambda();}// lambda操作文档public static void operateDocumentLambda() throws Exception{// 增加文档Result result = client.create(req ->req.index(INDEX_HOLMES).id("1001").document(new User(1001, "张三", 30))).result();System.out.println("文档创建的响应对象：" + result);// 批量添加数据ArrayList users = new ArrayList<>();for (int i = 0; i < 5; i++) {users.add(new User(3000 + i , "lisi" + i ,30 + i));}BulkResponse bulk = client.bulk(req -> {users.forEach(u -> {req.operations(b -> b.create(d -> d.index(INDEX_HOLMES).id(u.getId().toString()).document(u)));});return req;});System.out.println("批量新增数据的响应：" + bulk);// 文档删除DeleteResponse delete = client.delete(req -> req.index(INDEX_HOLMES).id("3001"));System.out.println("删除后的响应：" + delete);// 关闭transporttransport.close();}// 初始化ES服务器的连接public static void initESConnection() throws Exception{final BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();// 声明ES当前登录的账号密码credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials("elastic","3j=JYpywv=jMtQB+XIXS"));// 证书的路径Path caCertificatePath = Paths.get("E:\\itholmes\\demo\\itholmes-es8\\certs\\es-api-ca.crt");// x.509 , pkcs12都是 证书的算法CertificateFactory factory = CertificateFactory.getInstance("x.509");Certificate trustedCa;try (InputStream is = Files.newInputStream(caCertificatePath)){trustedCa = factory.generateCertificate(is);}KeyStore trustStore = KeyStore.getInstance("pkcs12");trustStore.load(null,null);trustStore.setCertificateEntry("ca",trustedCa);SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial(trustStore,null);SSLContext sslContext = sslContextBuilder.build();RestClientBuilder builder = RestClient.builder(new HttpHost("192.168.43.133", 9200, "https")).setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {@Overridepublic HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {return httpClientBuilder.setSSLContext(sslContext).setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE).setDefaultCredentialsProvider(credentialsProvider);}});// 创建客户端RestClient restClient = builder.build();// 通过客户端，创建传输对象transport = new RestClientTransport(restClient, new JacksonJsonpMapper());// 同步客户端对象client = new ElasticsearchClient(transport);// 异步客户端对象asyncClient = new ElasticsearchAsyncClient(transport);}}

2. 文档的查询

对象形式操作：

package com.itholmes.elasticsearch.api;import co.elastic.clients.elasticsearch.ElasticsearchAsyncClient;
import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.elasticsearch._types.Result;
import co.elastic.clients.elasticsearch._types.query_dsl.MatchQuery;
import co.elastic.clients.elasticsearch._types.query_dsl.Query;
import co.elastic.clients.elasticsearch.core.*;
import co.elastic.clients.elasticsearch.core.bulk.BulkOperation;
import co.elastic.clients.elasticsearch.core.bulk.CreateOperation;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;import javax.net.ssl.SSLContext;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.ArrayList;
import java.util.List;public class ESClient3 {private static ElasticsearchClient client;private static ElasticsearchAsyncClient asyncClient;private static ElasticsearchTransport transport;public static final String INDEX_HOLMES = "itholmes";public static void main(String[] args) throws Exception{// 初始化ES服务器的连接initESConnection();// fixme 文档查询操作queryDocument();}// 文档查询操作public static void queryDocument() throws Exception{MatchQuery matchQuery = new MatchQuery.Builder().field("age").query(30).build();Query query = new Query.Builder().match(matchQuery).build();SearchRequest searchRequest = new SearchRequest.Builder().query(query) // 传递条件.build();SearchResponse