node: always close database engine (#7113) (#8330)

internal/state/indexer/sink/kv/kv.go

@@ -18,14 +18,16 @@ var _ indexer.EventSink = (*EventSink)(nil)
 // The EventSink is an aggregator for redirecting the call path of the tx/block kvIndexer.
 // For the implementation details please see the kv.go in the indexer/block and indexer/tx folder.
 type EventSink struct {
-	txi *kvt.TxIndex
-	bi  *kvb.BlockerIndexer
+	txi   *kvt.TxIndex
+	bi    *kvb.BlockerIndexer
+	store dbm.DB
 }
 
 func NewEventSink(store dbm.DB) indexer.EventSink {
 	return &EventSink{
-		txi: kvt.NewTxIndex(store),
-		bi:  kvb.New(store),
+		txi:   kvt.NewTxIndex(store),
+		bi:    kvb.New(store),
+		store: store,
 	}
 }
 
@@ -58,5 +60,5 @@ func (kves *EventSink) HasBlock(h int64) (bool, error) {
 }
 
 func (kves *EventSink) Stop() error {
-	return nil
+	return kves.store.Close()
 }