SearchAPI - Index.get_range(ids_only=True) fails with 500 internal server error

[scragraham]

Summary
There is a call to /python/search/clean-up during the unittests which fails with a 500 internal server error.

Application Code

class CleanUpHandler(webapp2.RequestHandler):

  def post(self):
    indexes = search.get_indexes()
    for index in indexes:
      doc_ids = index.get_range(ids_only=True)
      index.delete(doc_ids)

Expected
Documents should be deleted from the Index

Actual
500 Internal server error is encountered.

Application Logs

ERROR    2018-12-12 20:06:54,350 webapp2.py:1528] Required field: status not set.
Traceback (most recent call last):
  File "/root/appscale/AppServer/lib/webapp2-2.3/webapp2.py", line 1511, in __call__
    rv = self.handle_exception(request, response, e)
  File "/root/appscale/AppServer/lib/webapp2-2.3/webapp2.py", line 1505, in __call__
    rv = self.router.dispatch(request, response)
  File "/root/appscale/AppServer/lib/webapp2-2.3/webapp2.py", line 1253, in default_dispatcher
    return route.handler_adapter(request, response)
  File "/root/appscale/AppServer/lib/webapp2-2.3/webapp2.py", line 1077, in __call__
    return handler.dispatch()
  File "/root/appscale/AppServer/lib/webapp2-2.3/webapp2.py", line 547, in dispatch
    return self.handle_exception(e, self.app.debug)
  File "/root/appscale/AppServer/lib/webapp2-2.3/webapp2.py", line 545, in dispatch
    return method(*args, **kwargs)
  File "/var/apps/hawkeyepython27_default_v1_1544644216773/app/search.py", line 104, in post
    indexes = search.get_indexes()
  File "/root/appscale/AppServer/google/appengine/api/search/search.py", line 672, in get_indexes
    fetch_schema=fetch_schema, **kwargs)
  File "/root/appscale/AppServer/google/appengine/api/search/search.py", line 719, in _GetIndexes
    apiproxy_stub_map.MakeSyncCall('search', 'ListIndexes', request, response)
  File "/root/appscale/AppServer/google/appengine/api/apiproxy_stub_map.py", line 94, in MakeSyncCall
    return stubmap.MakeSyncCall(service, call, request, response)
  File "/root/appscale/AppServer/google/appengine/api/apiproxy_stub_map.py", line 326, in MakeSyncCall
    rpc.CheckSuccess()
  File "/root/appscale/AppServer/google/appengine/api/apiproxy_rpc.py", line 234, in _make_sync_call
    self.stub.MakeSyncCall(service, call, request, response)
  File "/root/appscale/AppServer/google/appengine/ext/remote_api/remote_api_stub.py", line 201, in MakeSyncCall
    self._MakeRealSyncCall(service, call, request, response)
  File "/root/appscale/AppServer/google/appengine/ext/remote_api/remote_api_stub.py", line 238, in _MakeRealSyncCall
    raise pickle.loads(response_pb.exception())
ProtocolBufferDecodeError: Required field: status not set.
INFO     2018-12-12 20:06:54,360 module.py:651] default: "POST /python/search/clean-up HTTP/1.0" 500 228