docs: public static Map<String, StoreDefinition> getSystemStoreDefMap() {
          Map<String, StoreDefinition> sysStoreDefMap = Maps.newHashMap();
          List<StoreDefinition> storesDefs = SystemStoreConstants.getAllSystemStoreDefs();
          for(StoreDefinition def: storesDefs) {
              sysStoreDefMap.put(def.getName(), def);
          }
          return sysStoreDefMap;
      }