1<dependency>
2    <groupId>org.elasticsearch.client</groupId>
3    <artifactId>rest</artifactId>
4    <version>7.4.2</version>
5</dependency>
6<dependency>
7	    <groupId>org.apache.httpcomponents</groupId>
8    <artifactId>httpasyncclient</artifactId>
9    <version>4.1.4</version>
10</dependency>
11<dependency>
12    <groupId>org.apache.httpcomponents</groupId>
13    <artifactId>httpcore-nio</artifactId>
14    <version>4.4.13</version>
15</dependency>
16<dependency>
17    <groupId>org.apache.httpcomponents</groupId>
18    <artifactId>httpclient</artifactId>
19    <version>4.5.6</version>
20</dependency>
21<dependency>
22    <groupId>org.apache.httpcomponents</groupId>
23    <artifactId>httpcore</artifactId>
24    <version>4.4.12</version>
25</dependency>
26<dependency>
27    <groupId>commons-codec</groupId>
28    <artifactId>commons-codec</artifactId>
29    <version>1.10</version>
30</dependency>
31<dependency>
32    <groupId>commons-logging</groupId>
33    <artifactId>commons-logging</artifactId>
34    <version>1.2</version>
35</dependency>

1import java.io.IOException;
2import org.apache.http.HttpEntity;
3import org.apache.http.HttpHost;
4import org.apache.http.auth.AuthScope;
5import org.apache.http.auth.UsernamePasswordCredentials;
6import org.apache.http.client.CredentialsProvider;
7import org.apache.http.entity.ContentType;
8import org.apache.http.impl.client.BasicCredentialsProvider;
9import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
10import org.apache.http.nio.entity.NStringEntity;
11import org.apache.http.util.EntityUtils;
12import org.elasticsearch.client.Request;
13import org.elasticsearch.client.Response;
14import org.elasticsearch.client.RestClient;
15import org.elasticsearch.client.RestClientBuilder;
16
17public class RestClientTest742 {
18    public static void main(String[] args) {
19        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
20        //访问用户名和密码为您创建Elasticsearch实例时设置的用户名和密码。
21        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("{访问用户名}", "{访问密码}"));
22        // 通过builder创建rest client，配置http client的HttpClientConfigCallback。
23        // ES HTTP URL 在Baidu Elasticsearch界面中可以查询
24        RestClient restClient = RestClient.builder(new HttpHost("{ES HTTP URL}", 8200))
25                .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
26                    @Override
27                    public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
28                        return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
29                    }
30                }).build();
31        try {
32            // 创建request
33            Request request = new Request(
34                    "POST",
35                    "/{index_name}/_search");
36            // 配置请求体
37            request.setEntity(new NStringEntity("{\"query\":{\"match_all\":{}}}", ContentType.APPLICATION_JSON));
38            Response response = restClient.performRequest(request);
39            System.out.println(EntityUtils.toString(response.getEntity()));
40        } catch (IOException e) {
41            e.printStackTrace();
42        }
43    }
44}