diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/create_batches.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/create_batches.ts
index dc5b09d6c3379f..0fcbbc00ce7eaa 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/create_batches.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/create_batches.ts
@@ -56,7 +56,7 @@ export function buildTempIndexMap(
 ): Record<string, string> {
   return Object.entries(indexTypesMap || {}).reduce<Record<string, string>>(
     (acc, [indexAlias, types]) => {
-      const tempIndex = getTempIndexName(indexAlias, kibanaVersion!);
+      const tempIndex = getTempIndexName(indexAlias, kibanaVersion!) + '_alias';
 
       types.forEach((type) => {
         acc[type] = tempIndex;
diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.test.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.test.ts
index 77c82d1d0d5ff4..a20b517b7f3ba5 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.test.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.test.ts
@@ -303,7 +303,7 @@ describe('createBulkIndexOperationTuple', () => {
         Object {
           "index": Object {
             "_id": "",
-            "_index": ".kibana_cases_8.8.0_reindex_temp_alias",
+            "_index": ".kibana_cases_8.8.0_reindex_temp",
           },
         },
         Object {
diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts
index 41bd7945f41f6f..281b71fcbcc080 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/helpers.ts
@@ -228,7 +228,7 @@ export const createBulkIndexOperationTuple = (
       index: {
         _id: doc._id,
         ...(typeIndexMap[doc._source.type] && {
-          _index: typeIndexMap[doc._source.type] + '_alias',
+          _index: typeIndexMap[doc._source.type],
         }),
         // use optimistic concurrency control to ensure that outdated
         // documents are only overwritten once with the latest version