human
Solve the following python programming problem given the following code:
def __init__(self, beaver_config, logger = None) : 
    'Generic transport configuration
        Will attach the file_config object, setup the
        current hostname, and ensure we have a proper
        formatter for the current transport
        ' 
    self._beaver_config = beaver_config 
    self._current_host = beaver_config.get ('hostname') 
    self._default_formatter = beaver_config.get ('format', 'null') 
    self._formatters = { 
        
} 
    self._is_valid = True 
    self._logger = logger 
    self._epoch = datetime.datetime.utcfromtimestamp (0) 
    self._logstash_version = beaver_config.get ('logstash_version') 
    if (self._logstash_version == 0) : 
        self._fields = { 
            'type' : '@type', 
            'tags' : '@tags', 
            'message' : '@message', 
            'file' : '@source_path', 
            'host' : '@source_host', 
            'raw_json_fields' : ['@message', '@source', '@source_host', '@source_path', '@tags', '@timestamp', '@type'], 
} 
else : 
        if (self._logstash_version == 1) : 
            self._fields = { 
                'type' : 'type', 
                'tags' : 'tags', 
                'message' : 'message', 
                'file' : 'file', 
                'host' : 'host', 
                'raw_json_fields' : ['message', 'host', 'file', 'tags', '@timestamp', 'type'], 
} 
def raw_formatter(data) : 
        return data [self._fields.get ('message')] 
def rawjson_formatter(data) : 
        try : 
            json_data = json.loads (data [self._fields.get ('message')]) 
except ValueError : 
            self._logger.warning ('cannot parse as rawjson: {0}'.format (self._fields.get ('message'))) 
            json_data = json.loads ('{}') 
if json_data : 
            del data [self._fields.get ('message')] 
for field in json_data : 
            data [field] = json_data [field] 
for field in self._fields.get ('raw_json_fields') : 
            if (field not in data) : 
                data [field] = '' 
return json.dumps (data) 
def...

    
    

    Fix the buggy line: self._formatters ['rawjson'] = gelf_formatter
assistant
#Here is Python code to fix the buggy line: self.

self._formatters ['rawjson'] = def rawjson_formatter(