Instantiate an `LogEventStore` from config.

        Parameters:
        _config    -- the configuration file options read from file(s).
        **options -- various options given to the specific event store. Shall
                     not be used with this event store. Warning will be logged
                     for every extra non-recognized option. The only required
                     key to this function is 'path'.

        returns   -- a newly instantiated `LogEventStore`.

def from_config(config, **options):
        """Instantiate an `LogEventStore` from config.

        Parameters:
        _config    -- the configuration file options read from file(s).
        **options -- various options given to the specific event store. Shall
                     not be used with this event store. Warning will be logged
                     for every extra non-recognized option. The only required
                     key to this function is 'path'.

        returns   -- a newly instantiated `LogEventStore`.

        """
        expected_args = ('path',)
        rconfig.check_config_options("LogEventStore", expected_args, tuple(),
                                     options)
        return LogEventStore(options['path'])