最新版ES8的client API操作 Elasticsearch Java API client 8.0

在Elasticsearch 8.0中，Java API client提供了一系列的方法来操作Elasticsearch。以下是一些基本的操作示例：

1. 创建客户端：

RestClient restClient = RestClient.builder(new HttpHost("localhost", 9200, "http")).build();
ElasticsearchClient elasticsearchClient = new ElasticsearchClient(restClient);

2. 索引文档：

IndexOperationRequest indexOperationRequest = new IndexOperationRequest.Builder()
    .index("indexName")
    .id("documentId")
    .document(XContentType.JSON, "{ \"field\": \"value\" }")
    .build();
 
elasticsearchClient.index(indexOperationRequest, RequestOptions.DEFAULT);

3. 获取文档：

GetRequest getRequest = new GetRequest("indexName", "documentId");
GetResponse getResponse = elasticsearchClient.get(getRequest, RequestOptions.DEFAULT);

4. 更新文档：

UpdateRequest updateRequest = new UpdateRequest("indexName", "documentId");
updateRequest.doc(XContentType.JSON, "{ \"field\": \"newValue\" }");
elasticsearchClient.update(updateRequest, RequestOptions.DEFAULT);

5. 删除文档：

DeleteRequest deleteRequest = new DeleteRequest("indexName", "documentId");
elasticsearchClient.delete(deleteRequest, RequestOptions.DEFAULT);

6. 搜索文档：

SearchRequest searchRequest = new SearchRequest("indexName");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("field", "value"));
searchRequest.source(searchSourceBuilder);
 
SearchResponse searchResponse = elasticsearchClient.search(searchRequest, RequestOptions.DEFAULT);

注意：以上代码仅展示了如何使用Elasticsearch Java API client进行基本操作，实际使用时可能需要处理异常和其他选项。在实际应用中，你可能还需要创建一个ElasticsearchRestClient实例，并使用RequestOptions来配置请求的各种选项。