rename_file.java

try (InputStream s3InputStream = amazonS3Service.openStream(s3_bucket, s3_key)) {
    GridFSUploadOptions options = new GridFSUploadOptions().metadata(metaData);
    ObjectId newFileId = gridFSBucket.uploadFromStream(fileName, s3InputStream, options);

    // rename keys
    metaData.put("old_S3_key", metaData.get("S3_key"));
    metaData.put("old_S3_bucket", metaData.get("S3_bucket"));
    metaData.put("old_S3_enabled", metaData.get("S3_enabled"));
    metaData.remove("S3_key");
    metaData.remove("S3_bucket");
    metaData.remove("S3_enabled");

    fsFilesCollection.updateOne(Filters.eq("_id", fileId), Updates.combine(Updates.set("metadata", metaData)));
    log.info("Migrated file: " + fileName + " from S3 bucket: " + s3_bucket + " with key: " + s3_key);
} catch (Exception e) {
    log.severe("Error during migration: " + e.getMessage());
    throw e; // Propagate exception
}