diff --git a/src/core/server/integration_tests/saved_objects/migrations/group2/check_registered_types.test.ts b/src/core/server/integration_tests/saved_objects/migrations/group2/check_registered_types.test.ts
index be38a8225d0f4..760a00b1e0e30 100644
--- a/src/core/server/integration_tests/saved_objects/migrations/group2/check_registered_types.test.ts
+++ b/src/core/server/integration_tests/saved_objects/migrations/group2/check_registered_types.test.ts
@@ -144,7 +144,7 @@ describe('checking migration metadata changes on all registered SO types', () =>
         "telemetry": "561b329aaed3c15b91aaf2075645be3097247612",
         "ui-metric": "410a8ad28e0f44b161c960ff0ce950c712b17c52",
         "upgrade-assistant-ml-upgrade-operation": "e20ff1efa3c4757f5e7ff5fb897c557b08524c3a",
-        "upgrade-assistant-reindex-operation": "c7442ffe34954c117a74bf138e48e4c25095a6cf",
+        "upgrade-assistant-reindex-operation": "09ac8ed9c9acf7e8ece8eafe47d7019ea1472144",
         "upgrade-assistant-telemetry": "12bcbfc4e4ce64d2ca7c24f9acccd331a2bd2ab6",
         "uptime-dynamic-settings": "9a63ce80904a04be114749e426882dc3ff011137",
         "uptime-synthetics-api-key": "599319bedbfa287e8761e1ba49d536417a33fa13",
diff --git a/x-pack/plugins/upgrade_assistant/server/saved_object_types/reindex_operation_saved_object_type.ts b/x-pack/plugins/upgrade_assistant/server/saved_object_types/reindex_operation_saved_object_type.ts
index 36e32cfdea66b..d57909dd3f720 100644
--- a/x-pack/plugins/upgrade_assistant/server/saved_object_types/reindex_operation_saved_object_type.ts
+++ b/x-pack/plugins/upgrade_assistant/server/saved_object_types/reindex_operation_saved_object_type.ts
@@ -14,72 +14,14 @@ export const reindexOperationSavedObjectType: SavedObjectsType = {
   hidden: false,
   namespaceType: 'agnostic',
   mappings: {
+    dynamic: false,
     properties: {
-      reindexTaskId: {
-        type: 'text',
-        fields: {
-          keyword: {
-            type: 'keyword',
-            ignore_above: 256,
-          },
-        },
-      },
       indexName: {
         type: 'keyword',
       },
-      newIndexName: {
-        type: 'text',
-        fields: {
-          keyword: {
-            type: 'keyword',
-            ignore_above: 256,
-          },
-        },
-      },
       status: {
         type: 'integer',
       },
-      locked: {
-        type: 'date',
-      },
-      lastCompletedStep: {
-        type: 'long',
-      },
-      // Note that reindex failures can result in extremely long error messages coming from ES.
-      // We need to map these errors as text and use ignore_above to prevent indexing really large
-      // messages as keyword. See https://github.com/elastic/kibana/issues/71642 for more info.
-      errorMessage: {
-        type: 'text',
-        fields: {
-          keyword: {
-            type: 'keyword',
-            ignore_above: 256,
-          },
-        },
-      },
-      reindexTaskPercComplete: {
-        type: 'float',
-      },
-      runningReindexCount: {
-        type: 'integer',
-      },
-      reindexOptions: {
-        properties: {
-          openAndClose: {
-            type: 'boolean',
-          },
-          queueSettings: {
-            properties: {
-              queuedAt: {
-                type: 'long',
-              },
-              startedAt: {
-                type: 'long',
-              },
-            },
-          },
-        },
-      },
     },
   },
 };