'bytes' object has no attribute 'encode'

[apburton84]

File "/root/.local/share/virtualenvs/celery-jR7fJ1bi/lib/python3.5/site-packages/elasticsearch/client/utils.py", line 32, in _escape
    return value.encode('utf-8')
AttributeError: 'bytes' object has no attribute 'encode'

It appears that when _escape receives value, which in my case is b'celery-task-meta-c4f1201f-eb7b-41d5-9318-a75a8cfbdaa0', it gets checked against (<class 'str'>, <class 'bytes'>), and therefore passes the test but <class 'bytes'> does not have the encode method.

try does not catch as error is AttributeError: 'bytes' object has no attribute 'encode'

def _escape(value):
    """
    Escape a single value of a URL string or a query parameter. If it is a list
    or tuple, turn it into a comma-separated string first.
    """

    # make sequences into comma-separated stings
    if isinstance(value, (list, tuple)):
        value = ','.join(value)

    # dates and datetimes into isoformat
    elif isinstance(value, (date, datetime)):
        value = value.isoformat()

    # make bools into true/false strings
    elif isinstance(value, bool):
        value = str(value).lower()

    # encode strings to utf-8
    if isinstance(value, string_types):
        try:
            return value.encode('utf-8')
        except UnicodeDecodeError:
            # Python 2 and str, no need to re-encode
            pass

return str(value)