java 连接带认证的 elasticsearch

1.使用elasticsearch 官方提供客户端：org.elasticsearch.client.RestClientBuilder

pom.xml 添加依赖：

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-client</artifactId>
    <version>7.6.2</version>
</dependency>

java 代码：

 1         RestClientBuilder builder = RestClient.builder(new HttpHost(
 2                 "localhost",
 3                 9200,
 4                 "http")
 5         );
           // 此处添加认证 header 值为 Base64编码后的 user:password
 6         Header[] myheaders =  {
 7           new BasicHeader("Authorization","Basic YWJkaV9hZG1pbjpBRkVEb3ZNclRSeGdjcUpjRW5GREJPcUxIYUdLVHRkOXM5d0Uxd3NpVnI5TVZDenc=")
 8         };
 9         builder.setDefaultHeaders(myheaders);

10         RestClient client = builder.build();
11         String index = "secvisual.system_state";
12         String query = "{\"query\":{\"match_all\":{}}}";
13         try {
14             String searchIndex = String.format("/%s/_search?ignore_unavailable=%s", index, true);
15             Request request = new Request("GET", searchIndex);
16             request.setJsonEntity(query);
17 
18             Response response = client.performRequest(request);
19             if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
20                 System.out.println("query failed!");
21             }
22 
23             String body = EntityUtils.toString(response.getEntity());
24             System.out.println("query success, reuslt:" + body);
25         } catch (Exception e) {
26             System.out.println(e);
27         }
28         finally {
29             client.close();
30         }