private static Map<String, Param> createTikaParamMap(Map<String, Object> fetcherConfigMap) {
        Map<String, Param> tikaParamsMap = new HashMap<>();
        for (Map.Entry<String, Object> entry : fetcherConfigMap.entrySet()) {
            if (entry.getValue() != null) {
                tikaParamsMap.put(entry.getKey(), new Param<>(entry.getKey(), entry.getValue()));
            }
        }
        return tikaParamsMap;
    }
FetcherID is key, The pair is the Fetcher object and the Metadata
tika-grpc/src/main/java/org/apache/tika/pipes/grpc/TikaGrpcServerImpl.java