我一直在关注本教程（http://blog.florian-hopf.de/2014/07/scrapy-and-
elasticsearch.html）并使用这个易碎的elasticsearch管道（https://github.com/knockrentals/scrapy
-elasticsearch），并能够将数据从scrapy提取到JSON文件，并在本地主机上启动并运行Elasticsearch服务器。

但是，当我尝试使用管道将抓取的数据发送到elasticsearch时，出现以下错误：

2015-08-05 21:21:53 [scrapy] ERROR: Error processing {'link': [u'http://www.meetup.com/Search-Meetup-Karlsruhe/events/221907250/'],
 'title': [u'Alles rund um Elasticsearch']}
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/twisted/internet/defer.py", line 588, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/scrapyelasticsearch/scrapyelasticsearch.py", line 70, in process_item
    self.index_item(item)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/scrapyelasticsearch/scrapyelasticsearch.py", line 52, in index_item
    local_id = hashlib.sha1(item[uniq_key]).hexdigest()
TypeError: must be string or buffer, not list

我的items.py scrapy文件看起来像这样：

from scrapy.item import Item, Field

class MeetupItem(Item):
    title = Field()
    link = Field()
    description = Field()

和（我认为只有其中的相关部分）我的settings.py文件如下所示：

from scrapy import log

ITEM_PIPELINES = [
    'scrapyelasticsearch.scrapyelasticsearch.ElasticSearchPipeline',
]

ELASTICSEARCH_SERVER = 'localhost' # If not 'localhost' prepend 'http://'
ELASTICSEARCH_PORT = 9200 # If port 80 leave blank
ELASTICSEARCH_USERNAME = ''
ELASTICSEARCH_PASSWORD = ''
ELASTICSEARCH_INDEX = 'meetups'
ELASTICSEARCH_TYPE = 'meetup'
ELASTICSEARCH_UNIQ_KEY = 'link'
ELASTICSEARCH_LOG_LEVEL= log.DEBUG

任何帮助将不胜感激！