@gensim.utils.synchronous('<STR_LIT>')<EOL><INDENT>def drop_index(self, keep_model=True):<DEDENT>
self.check_session()<EOL>result = self.session.drop_index(keep_model)<EOL>if self.autosession:<EOL><INDENT>self.commit()<EOL><DEDENT>return result<EOL>
Drop all indexed documents from the session. Optionally, drop model too.