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环境：我使用 Python 2.7.2 运行 Django==1.5.4，部署到 Heroku。我正在使用带有弹性搜索的 Haystack。在 Heroku 上，我使用的是 Bonsai Elastic Search 插件。

问题：当我运行rebuild_index 命令时，在销毁索引时遇到“读取超时错误”，在尝试创建索引时遇到“IndexMissingException”。日志输出是这样的：

> heroku run python manage.py rebuild_index
Running `python manage.py rebuild_index` attached to terminal... up, run.1762

WARNING: This will irreparably remove EVERYTHING from your search index in connection 'default'.
Your choices after this are to restore from backups or rebuild via the `rebuild_index` command.
Are you sure you wish to continue? [y/N] y
Removing all documents from your index because you said so.
Failed to clear Elasticsearch index: Non-OK response returned (404): u'IndexMissingException[[msdc] missing]'
All documents removed.
Indexing 195 schools
ERROR:root:Error updating schools using default 
Traceback (most recent call last):
  File "/app/.heroku/python/lib/python2.7/site-packages/haystack/management/commands/update_index.py", line 221, in handle_label
    self.update_backend(label, using)
  File "/app/.heroku/python/lib/python2.7/site-packages/haystack/management/commands/update_index.py", line 267, in update_backend
    do_update(backend, index, qs, start, end, total, self.verbosity)
  File "/app/.heroku/python/lib/python2.7/site-packages/haystack/management/commands/update_index.py", line 89, in do_update
    backend.update(index, current_qs)
  File "/app/.heroku/python/lib/python2.7/site-packages/haystack/backends/elasticsearch_backend.py", line 183, in update
    self.conn.bulk_index(self.index_name, 'modelresult', prepped_docs, id_field=ID)
  File "/app/.heroku/python/lib/python2.7/site-packages/pyelasticsearch/client.py", line 96, in decorate
    return func(*args, query_params=query_params, **kwargs)
  File "/app/.heroku/python/lib/python2.7/site-packages/pyelasticsearch/client.py", line 387, in bulk_index
    query_params=query_params)
  File "/app/.heroku/python/lib/python2.7/site-packages/pyelasticsearch/client.py", line 254, in send_request
    self._raise_exception(resp, prepped_response)
  File "/app/.heroku/python/lib/python2.7/site-packages/pyelasticsearch/client.py", line 268, in _raise_exception
    raise error_class(response.status_code, error_message)
ElasticHttpNotFoundError: (404, u'IndexMissingException[[msdc] missing]')
ElasticHttpNotFoundError: (404, u'IndexMissingException[[msdc] missing]')

验证：我已经明确地创建了索引，我通过尝试重新创建它并运行测试步骤来验证它：

> curl -X POST http://index@box.us-east-1.bonsai.io/msdc
{"error":"Index already exists.","status":400}%

> curl -X POST http://index@boc.us-east-1.bonsai.io/msdc/test -d '{"title":"hello, world"}'
{"ok":true,"_index":"msdc","_type":"test","_id":"9q8t4m0sTgy6JeGkueL54Q","_version":1}%   

> curl -X POST http://index@box.us-east-1.bonsai.io/msdc/_search -d '{}'                  
{"took":2,"timed_out":false,"_shards":{"total":1,"successful":1,"failed":0},"hits":{"total":1,"max_score":1.0,"hits":[{"_index":"msdc","_type":"test","_id":"9q8t4m0sTgy6JeGkueL54Q","_score":1.0, "_source" : {"title":"hello, world"}}]}}%

我对 Elasticsearch 和 Heroku 还很陌生，所以我可能错过了一个关键步骤。任何帮助解决此错误将不胜感激！

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