docs: def ReadClientPostingLists(self, keywords):
      """Looks up all clients associated with any of the given keywords.
  
      Args:
        keywords: A list of keywords we are interested in.
  
      Returns:
        A dict mapping each keyword to a list of matching clients.
      """
  
      start_time, end_time, filtered_keywords, _ = self._AnalyzeKeywords(keywords)
  
      # TODO(user): Make keyword index datetime aware so that
      # AsMicrosecondsSinceEpoch is unecessary.
      return self.ReadPostingLists(
          filtered_keywords,
          start_time=start_time.AsMicrosecondsSinceEpoch(),
          end_time=end_time.AsMicrosecondsSinceEpoch())