$reindex does not update lucene / elastic index

[jnugh]

Describe the bug
The $reindex operation does not recreate the resourcetable index when advancedHSearchIndexing is enabled. Even though data is being indexed when writing resources using POST / PUT.

To Reproduce
Steps to reproduce the behavior:

1. Set up a server with elasticsearch index (using jpa starter enable: advanced_lucene_indexing, elasticsearch.*, hibernate.search.backend.type: elasticsearch)
2. Create some Resources (e.g. using POST / PUT)
3. Delete data from the elasticsearch index (or switch the options from above on at this point)
4. POST to /fhir/$reindex
5. Da a search e.g. using _contents

Expected behavior
It should return matching results after reindex, even though they have been manually removed from the index.

Environment (please complete the following information):

• HAPI FHIR Version: jpa starter master (7.0.2)
• OS: MacOS
• Browser: n/a

Additional context
I did some debugging already. When updating an entity the lucene indexer creates a new elasticsearch document when
https://github.com/hapifhir/hapi-fhir/blob/master/hapi-fhir-jpaserver-base/src/main/java/ca/uhn/fhir/jpa/dao/BaseHapiFhirResourceDao.java#L2282

		return myTransactionService
				.withRequest(theRequest)
				.withTransactionDetails(theTransactionDetails)
				.withRequestPartitionId(requestPartitionId)
				.onRollback(onRollback)
				.execute(updateCallback);

is being called inside the update method.
During reindex this dos not happen. reindex calls reindexSearchParameters which correctly updates the index tables but does not write the resource itself. Thus never reaching the search index logic.