No need to call XLogEnsureRecordSpace when the relation is unlogged.

Amit Kapila

src/backend/access/gin/ginfast.c

@@ -552,6 +552,7 @@ shiftList(Relation index, Buffer metabuffer, BlockNumber newHead,
 		 * prepare the XLogInsert machinery for that before entering the
 		 * critical section.
 		 */
+		if (RelationNeedsWAL(index))
 			XLogEnsureRecordSpace(data.ndeleted, 0);
 
 		START_CRIT_SECTION();