diff --git a/doc/src/sgml/monitoring.sgml b/doc/src/sgml/monitoring.sgml
index b403fb990a7..4c1d4b2a80a 100644
--- a/doc/src/sgml/monitoring.sgml
+++ b/doc/src/sgml/monitoring.sgml
@@ -6806,8 +6806,8 @@ FROM pg_stat_get_backend_idset() AS backendid;
        <structfield>cluster_index_relid</structfield> <type>oid</type>
       </para>
       <para>
-       If the table is being scanned using an index, this is the OID of the
-       index being used; otherwise, it is zero.
+       OID of the index defining the order of the rewritten table, or zero
+       if no index ordering is requested.
       </para></entry>
      </row>
 
@@ -7480,8 +7480,8 @@ FROM pg_stat_get_backend_idset() AS backendid;
        <structfield>repack_index_relid</structfield> <type>oid</type>
       </para>
       <para>
-       If the table is being scanned using an index, this is the OID of the
-       index being used; otherwise, it is zero.
+       OID of the index defining the order of the rewritten table, or zero
+       if no index ordering is requested.
       </para></entry>
      </row>
 
diff --git a/src/backend/access/heap/heapam_handler.c b/src/backend/access/heap/heapam_handler.c
index 0f24a132564..dd2218bbbaf 100644
--- a/src/backend/access/heap/heapam_handler.c
+++ b/src/backend/access/heap/heapam_handler.c
@@ -660,16 +660,8 @@ heapam_relation_copy_for_cluster(Relation OldHeap, Relation NewHeap,
 	 */
 	if (OldIndex != NULL && !use_sort)
 	{
-		const int	ci_index[] = {
-			PROGRESS_REPACK_PHASE,
-			PROGRESS_REPACK_INDEX_RELID
-		};
-		int64		ci_val[2];
-
-		/* Set phase and OIDOldIndex to columns */
-		ci_val[0] = PROGRESS_REPACK_PHASE_INDEX_SCAN_HEAP;
-		ci_val[1] = RelationGetRelid(OldIndex);
-		pgstat_progress_update_multi_param(2, ci_index, ci_val);
+		pgstat_progress_update_param(PROGRESS_REPACK_PHASE,
+									 PROGRESS_REPACK_PHASE_INDEX_SCAN_HEAP);
 
 		tableScan = NULL;
 		heapScan = NULL;
diff --git a/src/backend/commands/repack.c b/src/backend/commands/repack.c
index 57f28f1a420..6f7c37c39b2 100644
--- a/src/backend/commands/repack.c
+++ b/src/backend/commands/repack.c
@@ -511,6 +511,11 @@ cluster_rel(RepackCommand cmd, Relation OldHeap, Oid indexOid,
 	bool		recheck = ((params->options & CLUOPT_RECHECK) != 0);
 	bool		concurrent = ((params->options & CLUOPT_CONCURRENT) != 0);
 	Oid			ident_idx = InvalidOid;
+	const int	progress_index[] = {
+		PROGRESS_REPACK_COMMAND,
+		PROGRESS_REPACK_INDEX_RELID
+	};
+	const int64 progress_values[] = {cmd, indexOid};
 
 	/* Determine the lock mode to use. */
 	lmode = RepackLockLevel(concurrent);
@@ -526,7 +531,8 @@ cluster_rel(RepackCommand cmd, Relation OldHeap, Oid indexOid,
 	CHECK_FOR_INTERRUPTS();
 
 	pgstat_progress_start_command(PROGRESS_COMMAND_REPACK, tableOid);
-	pgstat_progress_update_param(PROGRESS_REPACK_COMMAND, cmd);
+	/* Report the ordering index even when using a sequential scan and sort. */
+	pgstat_progress_update_multi_param(2, progress_index, progress_values);
 
 	/*
 	 * Switch to the table owner's userid, so that any index functions are run