<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_ids(self, start=0, rows=1000, **query_dict):
 """Retrieve a list of identifiers for documents matching the query."""

        resp_dict = self._get_query(start=start, rows=rows, **query_dict)
        return {
            'matches': resp_dict['response']['numFound'],
            'start': start,
            'ids': [d['id'] for d in resp_dict['response']['docs']],
        }