code: def BatchConvert(self, metadata_value_pairs, token=None):
      
  
      urns = [urn for metadata, urn in metadata_value_pairs]
      urns_dict = dict((urn, metadata) for metadata, urn in metadata_value_pairs)
  
      results = []
      for hash_urn, client_files in filestore.HashFileStore.GetClientsForHashes(
          urns, token=token):
        for hit in client_files:
          metadata = ExportedMetadata(urns_dict[hash_urn])
          metadata.client_urn = rdfvalue.RDFURN(hit).Split(2)[0]
  
          result = ExportedFileStoreHash(
              metadata=metadata,
              hash=hash_urn.hash_value,
              fingerprint_type=hash_urn.fingerprint_type,
              hash_type=hash_urn.hash_type,
              target_urn=hit)
          results.append(result)
  
      return results
docs: Convert batch of FileStoreHashs.