Wrong query specification for datastore.find()

[alsroot]

Method documentation says:

    query -- a dictionary containing metadata key value pairs
             for a fulltext search use the key 'query' e.g. {'query': 'blue*'}
             other possible well-known properties are:
             'activity':          'my.organization.MyActivity'
             'activity_id':       '6f7f3acacca87886332f50bdd522d805f0abbf1f'
             'title':             'My new project'
             'title_set_by_user': '0'
             'keep':              '0'
             'ctime':             '1972-05-12T18:41:08'
             'mtime':             '2007-06-16T03:42:33'
             'timestamp':         1192715145
             'preview':           ByteArray(png file data, 300x225 px)
             'icon-color':        '#ff0000,#ffff00'
             'mime_type':         'application/x-my-activity'
             'share-scope':       # if shared
             'buddies':           '{}'
             'description':       'some longer text'
             'tags':              'one two'
}}

but supported on ds level search terms are:

* uid
* activity
* activity_id
* mime_type
* keep