opensearch java实例_Elasticsearch Client(JAVA API) JAVA实例

以下是一个简单的 Elasticsearch Client(JAVA API) 的 JAVA 实例，使用的是 Elasticsearch 7.x 版本的 API：

1. 添加 Maven 依赖

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.10.1</version>
</dependency>

2. 创建 Elasticsearch 客户端连接

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("localhost", 9200, "http")
        )
);

3. 创建索引

CreateIndexRequest request = new CreateIndexRequest("my_index");
client.indices().create(request, RequestOptions.DEFAULT);

4. 添加文档

IndexRequest request = new IndexRequest("my_index");
request.id("1");
String jsonString = "{" +
        "\"name\":\"John\"," +
        "\"age\":30," +
        "\"city\":\"New York\"" +
        "}";
request.source(jsonString, XContentType.JSON);
IndexResponse response = client.index(request, RequestOptions.DEFAULT);

5. 搜索文档

SearchRequest searchRequest = new SearchRequest("my_index");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("name", "John"));
searchRequest.source(searchSourceBuilder);
SearchResponse response = client.search(searchRequest, RequestOptions.DEFAULT);

6. 关闭客户端连接

client.close();