Account for changes in translations for documents in ServicingSearchIndex#aggregateTranslations

When there are no hippo:translation nodes any more below a handle but instead something like hippo:name on the handle, we must also account for this during indexing : Namely, the name of a document is part of its free text search.

We need to account for this similar as we do in org.hippoecm.repository.query.lucene.ServicingSearchIndex#aggregateTranslations

NOTE we do need also a unit test that confirms that if the hippo:name on the handle is changed, the documents below it are re-indexed : We can validate this with a unit test that does a free text search on the document below the handle