'Finds all objects associated with any of the keywords.
Args:
keywords: A collection of keywords that we are interested in.
start_time: Only considers keywords added at or after this point in time.
end_time: Only considers keywords at or before this point in time.
last_seen_map: If present, is treated as a dict and populated to map pairs
(keyword, name) to the timestamp of the latest connection found.
Returns:
A dict mapping each keyword to a set of relevant names.'

def ReadPostingLists(self, keywords, start_time=FIRST_TIMESTAMP, end_time=LAST_TIMESTAMP, last_seen_map=None):

    return data_store.DB.IndexReadPostingLists(self.urn, keywords, start_time, end_time, last_seen_map=last_seen_map, token=self.token)
