private List<String> getStreamIdsForSystem(String system) {
    return getStreamIds().stream().filter(streamId -> system.equals(getSystem(streamId))).collect(Collectors.toList());
  }
Gets the distinct stream IDs of all the streams defined in the config

@return collection of stream IDs
samza-core/src/main/java/org/apache/samza/config/StreamConfig.java