DocketEntry.DoesNotExist: Removing a RECAPDocument from ES.

[sentry-io]

This has happened once so far. The problem seems to be that the RECAPDocument was deleted from the database, and then the "handle_delete" method in "es_signal_processor" couldn't retrieve its routing ID.

Sentry Issue: COURTLISTENER-76Q

CancelledError: 
DocketEntry.DoesNotExist: DocketEntry matching query does not exist.
(22 additional frame(s) were not displayed)
...
  File "cl/recap/mergers.py", line 730, in get_or_make_docket_entry
    de = await merge_unnumbered_docket_entries(des, docket_entry)
  File "cl/recap/mergers.py", line 595, in merge_unnumbered_docket_entries
    await matched_entries_queryset.exclude(pk=winner.pk).adelete()
  File "cl/lib/elasticsearch_utils.py", line 95, in wrapper_func
    func(*args, **kwargs)
  File "cl/lib/es_signal_processor.py", line 791, in handle_delete
    doc_id, routing_id = get_es_doc_id_and_parent_id(
  File "cl/search/tasks.py", line 559, in get_es_doc_id_and_parent_id
    parent_id = getattr(instance.docket_entry, "docket_id", None)

Filed by: @albertisfu