final String key = e.getKey();
            if (StringUtil.isBlank(key)) {
                return false;
            }
            return pattern.matcher(key).matches();
        }).collect(Collectors.toMap(Entry<String, String>::getKey, Entry<String, String>::getValue));
    }

    /**
     * Gets a map of environment variables.
     *
     * @return A map of environment variables.
     */

            if (fields != null) {
                final Map<String, Object> docMap = fields.entrySet()
                        .stream()
                        .collect(Collectors.toMap(Entry<String, DocumentField>::getKey, e -> (Object) e.getValue().getValues()));
                docMap.put(fessConfig.getIndexFieldId(), hit.getId());
                docMap.put(fessConfig.getIndexFieldVersion(), hit.getVersion());

		opts := miniogo.PutObjectOptions{
			UserMetadata:         srcInfo.UserDefined,
			ServerSideEncryption: dstOpts.ServerSideEncryption,
			UserTags:             tag.ToMap(),
		}
		remoteObjInfo, rerr := core.PutObject(ctx, dstBucket, dstObject, srcInfo.Reader,
			srcInfo.Size, "", "", opts)
		if rerr != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, rerr), r.URL)
			return