Elasticsearch 6.5.4 Java Api

以下是 Elasticsearch 6.5.4 Java API 的一些示例：

1. 连接 Elasticsearch：

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("localhost", 9200, "http"),
                new HttpHost("localhost", 9201, "http")));

2. 索引文档：

IndexRequest request = new IndexRequest("index_name", "type_name", "document_id");
String jsonString = "{" +
        "\"user\":\"kimchy\"," +
        "\"postDate\":\"2013-01-30\"," +
        "\"message\":\"trying out Elasticsearch\"" +
        "}";
request.source(jsonString, XContentType.JSON);
IndexResponse response = client.index(request);

3. 搜索文档：

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchQuery("field_name", "search_text"));
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest);

4. 删除文档：

DeleteRequest request = new DeleteRequest("index_name", "type_name", "document_id");
DeleteResponse response = client.delete(request);

注意：以上示例代码需要使用 Elasticsearch 6.5.4 版本的 Java API 和对应的 Elasticsearch 服务器版本。