<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fix_keys(self):
 """ Remove the _ from the keys of the results """

        if not self.valid:
            return

        for hit in self._results['hits']['hits']:
            for key, item in list(hit.items()):
                if key.startswith("_"):
                    hit[key[1:]] = item
                    del hit[key]