def __init__(self, index_id, doc_type, query_class, log):
self.index_id = index_id
self.doc_type = doc_type
self.query_engine = DSLQueryEngine(query_class)
self.log = log
# TODO(emfree): probably want to try to keep persistent connections
# around, instead of creating a new one each time.
self._connection = new_connection()
