Cannot remove deleted un-versioned DataObject from Elastic index

[adunn49]

When a data object or page is deleted from the CMS, a job is created (via the onAfterDelete method defined in the SearchServiceExtension) that should remove this item from the search index.

However, in the case of un-unversioned DataObjects this results in a broken job. This is because the unserialize method expects the DataObject to still exist but by then it has been deleted and no traces of it remain.

This issue was detected in version 2.1.0 of this module.