V4 Search API serializer errors

[sentry-io]

This is an error I got while testing in production over the new V4 Search API.

This one is related to the 'cites' field. It seems that in some documents it can get properly serialized.

Sentry Issue: COURTLISTENER-76S

KeyError: 'cites'
  File "elasticsearch_dsl/utils.py", line 151, in __getattr__
    return self.__getitem__(attr_name)
  File "elasticsearch_dsl/utils.py", line 166, in __getitem__
    return _wrap(self._d_[key])

AttributeError: 'DocketDocument' object has no attribute 'cites'
  File "rest_framework/fields.py", line 447, in get_attribute
    return get_attribute(instance, self.source_attrs)
  File "rest_framework/fields.py", line 97, in get_attribute
    instance = getattr(instance, attr)
  File "elasticsearch_dsl/utils.py", line 472, in __getattr__
    return super().__getattr__(name)
  File "elasticsearch_dsl/utils.py", line 153, in __getattr__
    raise AttributeError(

AttributeError: Got AttributeError when attempting to get a value for field `cites` on serializer `BaseRECAPDocumentESResultSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `DocketDocument` instance.
Original exception text was: 'DocketDocument' object has no attribute 'cites'.
(9 additional frame(s) were not displayed)
...
  File "cl/search/api_views.py", line 275, in list
    return paginator.get_paginated_response(serializer.data)

Filed by @albertisfu

[sentry-io]

This is another serialization error, likely related to an integer field that is missing in a document and not properly handled.

Sentry Issue: COURTLISTENER-76R

Filed by: @albertisfu