java 操作elasticsearch详细总结

在Java中操作Elasticsearch，你可以使用Elasticsearch的Java Rest Client。以下是一些常见的操作：

1. 创建或更新文档：

IndexRequest request = new IndexRequest("index_name", "_doc", "id");
request.source(XContentType.JSON, "field", "value");
client.index(request, RequestOptions.DEFAULT);

2. 获取文档：

GetRequest getRequest = new GetRequest("index_name", "_doc", "id");
GetResponse getResponse = client.get(getRequest, RequestOptions.DEFAULT);

3. 删除文档：

DeleteRequest deleteRequest = new DeleteRequest("index_name", "_doc", "id");
client.delete(deleteRequest, RequestOptions.DEFAULT);

4. 搜索文档：

SearchRequest searchRequest = new SearchRequest("index_name");
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
searchSourceBuilder.query(QueryBuilders.matchAllQuery());
searchRequest.source(searchSourceBuilder);
SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);

5. 创建或更新索引：

CreateIndexRequest request = new CreateIndexRequest("index_name");
request.settings(Settings.builder().loadFromSource(jsonSettings));
client.indices().create(request, RequestOptions.DEFAULT);

6. 删除索引：

DeleteIndexRequest request = new DeleteIndexRequest("index_name");
client.indices().delete(request, RequestOptions.DEFAULT);

确保在使用完毕后关闭客户端：

client.close();

注意：以上代码示例假设client是已经创建并连接到Elasticsearch的RestHighLevelClient实例。在实际应用中，你需要处理可能发生的异常，并且在实际的生产代码中，你可能还需要配置连接池和其他相关的参数。