Unified Storage: Update index when indexqueueprocessor exists (#109351)

* Update readme

* When queue processor already exists, update the index on it in case it has been closed.

* Adds regression test.

pkg/storage/unified/resource/search.go

@@ -943,6 +943,8 @@ func (s *searchSupport) getOrCreateIndexQueueProcessor(index ResourceIndex, nsr
 
 	key := fmt.Sprintf("%s/%s/%s", nsr.Namespace, nsr.Group, nsr.Resource)
 	if indexQueueProcessor, ok := s.indexQueueProcessors[key]; ok {
+		// index stored on existing processor may have been closed and rebuilt, so we need to update it
+		indexQueueProcessor.index = index
 		return indexQueueProcessor, nil
 	}