ES8的Java API client 8.0 简单示例操作 Elasticsearch

1.加入依赖

      <dependency>
            <groupId>co.elastic.clients</groupId>
            <artifactId>elasticsearch-java</artifactId>
            <version>8.12.2</version>
        </dependency>

2.配置类

@Slf4j
@Configuration
public class ElasticSearchConfig {
    @Value("${elasticsearch.hosts}")
    private String hosts;
    @Value("${elasticsearch.port}")
    private int port;
    @Value("${elasticsearch.username}")
    private String username;
    @Value("${elasticsearch.password}")
    private String password;
    @Value("${elasticsearch.apikey:''}")
    private String apikey;

    /**
     * 单节点没密码连接
     *
     * @return
     */
    @Bean
    public ElasticsearchClient elasticsearchClient() {
        String[] servers = hosts.split(",");
        int len = servers.length;
        if (0 == len) {
            log.error("ElasticsearchClient 配置错误!");
        }
        ElasticsearchTransport transport = null;
        // 不是集群时
        if (1 == len) {
            // 无账号、密码
            if (StringUtils.isEmpty(username) && StringUtils.isEmpty(password)) {
                RestClient client = RestClient.builder(new HttpHost(servers[0], port, "http"))
                        .setHttpClientConfigCallback(httpClientBuilder
                                ->httpClientBuilder.setDefaultHeaders(
                                        Collections.singletonList(new BasicHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString())))
                                .addInterceptorLast((HttpResponseInterceptor) (response, context)
                                        -> response.addHeader("X-Elastic-Product", "Elasticsearch")))
                        .build();
                transport = new RestClientTransport(client, new JacksonJsonpMapper());
            } else {
                // 账号密码的配置
                final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
                credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));
                // 自签证书的设置，并且还包含了账号密码
                RestClientBuilder.HttpClientConfigCallback callback = httpAsyncClientBuilder -> httpAsyncClientBuilder
                        .setDefaultCredentialsProvider(credentialsProvider)
                        .addInterceptorLast(
                                (HttpResponseInterceptor)
                                        (response, context) ->
                                                response.addHeader("X-Elastic-Product", "Elasticsearch"));

                RestClient client = RestClient.builder(new HttpHost(servers[0], port, "http"))
                        .setHttpClientConfigCallback(callback)
                        .build();
                transport = new RestClientTransport(client, new JacksonJsonpMapper());
            }
        } else {
            // 集群时无账号、密码
            if (StringUtils.isEmpty(username) && StringUtils.isEmpty(password)) {
                transport = getElasticsearchTransport(toHttpHost());
            } else {
                transport = getElasticsearchTransport(username, password, toHttpHost());
            }
        }
        return new ElasticsearchClient(transport);
    }


    private HttpHost[] toHttpHost() {
        if (hosts.split(",").length == 0) {
            throw new RuntimeException("invalid elasticsearch configuration");
        }
        String[] hostArray = hosts.split(",");
        HttpHost[] httpHosts = new HttpHost[hostArray.length];
        HttpHost httpHost;
        for (int i = 0; i < hostArray.length; i++) {
            String[] strings = hostArray[i].split(":");
            httpHost = new HttpHost(strings[0], Integer.parseInt(strings[1]), &#