During $delete-expunge job, hibernate search indexed documents are left orphaned.

[tadgh]

1. Enable hibernate search (either lucene/elasticsearch).
2. Create some data
3. Query Elasticsearch to see that resourcetable-000001 index contains documents. \
4. Run a $delete-expunge job.
5. Wait for it to complete

Expected Behaviour:

• resources expunged from database should also be expunged from the hibernate search index.

Actual Behaviour:

• Documents representing expunged resources remain visible in Elasticsearch.

Expunging should also clean out the HS indexes.