Prevent notice.
Delete entity from index.
Try to bulk delete items.
Mark for insert.
Minor cleanup.
Fix.
Merge branch 'SCHOLAR-3.x' into 1307-1
Mark for index.
More work.
Prevent notice.
More fixes.
Merge branch 'SCHOLAR-3.x' into 1307-1
Use status callback.
Fix logic.
Fix return value.
Merge pull request #3139 from openscholar/1307-1

Delete/ insert entity from Solr index when excluded/ included