public boolean exist(String path) {
    return helixStore.exists(path, AccessOption.PERSISTENT);
  }
Checks if a path exists in the store.
@param path The path to check. This is a relative path under the store root path.
@return {@code true} if the path exists.
ambry-clustermap/src/test/java/com/github/ambry/clustermap/HelixStoreOperator.java