Debian安装和使用Elasticsearch 8.9

命令行通过 .deb 包安装 Elasticsearch

elastic

创建一个新用户

adduser elastic --> rust
# 添加sudo权限
# https://phoenixnap.com/kb/how-to-create-sudo-user-on-ubuntu
usermod -aG sudo elastic
groups elastic

下载Elasticsearch v8.9.0 Debian 包

https://www.elastic.co/guide/en/elasticsearch/reference/current/deb.html#install-deb

Elasticsearch: 初学者指南

https://medium.com/@animeshblog/elasticsearch-the-beginners-cookbook-1cf30f98218

快速开始

主要参考：Verifying HTTPS with a certificate fingerprint

创建 Elasticsearch Java客户端

package org.elastic.service.es;import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.TransportUtils;
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.elasticsearch.client.RestClient;import javax.net.ssl.SSLContext;/*** <a href="https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/current/connecting.html#_verifying_https_with_a_certificate_fingerprint">Verifying HTTPS with a certificate fingerprint</a>*/
public class MEElastic {/*** The SHA-256 fingerprint of the certificate used to sign the Elasticsearch server certificate.* <p>* come from <a href="https://security.stackexchange.com/a/14345">What is the actual value of a certificate fingerprint?</a>*/private static final String fingerprint = "2c895506b07083da7299656fa7fc4b433c3e26c03cf1a99eef23c537711b6e6e";private static final String esUsername = "elastic";private static final String esPassword = "k_*t_arOy7RF6EQVL-QA";private RestClient elasticsearchRestClient() {SSLContext sslContext = TransportUtils.sslContextFromCaFingerprint(fingerprint);BasicCredentialsProvider credsProv = new BasicCredentialsProvider();credsProv.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(esUsername, esPassword));return RestClient.builder(new HttpHost("127.0.0.1", 9200, "https")).setHttpClientConfigCallback(hc -> hc.setSSLContext(sslContext).setDefaultCredentialsProvider(credsProv).setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE)).build();}public ElasticsearchClient elasticsearchClient() {// Create the transport and the API clientElasticsearchTransport transport = new RestClientTransport(elasticsearchRestClient(), new JacksonJsonpMapper());return new ElasticsearchClient(transport);}
}

测试ElasticsearchClient

@Test
void elasticsearchClient() throws IOException {MEElastic meElastic = new MEElastic();ElasticsearchClient esClient = meElastic.elasticsearchClient();GetIndexResponse rsp = esClient.indices().get(request -> request.index("test"));System.out.println(rsp);esClient._transport().close();
}