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Too much MongoDB server memory usage when saving large file (3Gb) with GridFS. Help fix, please.

let uploadStream: GridFSBucketWriteStream
let readableUpload: Readable

uploadStream = bucket.openUploadStream(chunkName)
readableUpload = new Readable()

readableUpload.push(req.file?.buffer)
readableUpload.push(null)

readableUpload.pipe(uploadStream)
new Promise((resolve, reject) => {
    uploadStream.on('finish', (g) => {
        readableUpload.destroy();
        resolve(g);
    });
    
    uploadStream.on('error', (error) => {
        readableUpload.destroy();
        reject(error);
    });
    
    readableUpload.on('error', (error) => {
        uploadStream.destroy();
        reject(error);
    });
});