When downoading from sharepoint with buffer size always getting maximum 8K buffer and not as we asked

Describe the bug

When downloading file from sharepoint using graph api and set the buffer size to be downloaded only 8K ( maximum) is fetched ) instread of the given buffer size.
InputStream inputStream = graphServiceClient.drives().byDriveId(driveId).items().byDriveItemId(getDriveItemIdFromRootPath(filePath)).content().get();
byte[] buf = new byte[cloudPartSizeWhenDownloadingToLocal];
int bytesRead;
while ((bytesRead = srcInputStream.read(buf)) != -1) {
byresRead is always maximum 8K and not per demand
}

Expected behavior

The bytess returned from this method should aline with the request.

How to reproduce

see above

SDK Version

6.25.1

Latest version known to work for scenario above?

No response

Known Workarounds

No response

Debug output

</details>


### Configuration

_No response_

### Other information

_No response_

从 graphServiceClient.drives().byDriveId(...).content().get() 调用开始，检查返回的 Java InputStream 如何为 SharePoint 下载处理 read(byte[])。将观察到的 8K 读取与 Java InputStream 的契约以及 SDK 的流实现进行比较；当所请求的缓冲行为得到修正，或由回归测试明确覆盖时，即表示完成。