diff --git a/packages/core/saved-objects/core-saved-objects-api-server-internal/index.ts b/packages/core/saved-objects/core-saved-objects-api-server-internal/index.ts
index 383ab648b3fd1..73b3bc2777aae 100644
--- a/packages/core/saved-objects/core-saved-objects-api-server-internal/index.ts
+++ b/packages/core/saved-objects/core-saved-objects-api-server-internal/index.ts
@@ -7,8 +7,6 @@
  */
 
 export {
-  getRootFields,
-  type RootField,
   SavedObjectsRepository,
   SavedObjectsClient,
   SavedObjectsClientProvider,
diff --git a/packages/core/saved-objects/core-saved-objects-api-server-internal/src/index.ts b/packages/core/saved-objects/core-saved-objects-api-server-internal/src/index.ts
index bc8caf6189705..38811b1948551 100644
--- a/packages/core/saved-objects/core-saved-objects-api-server-internal/src/index.ts
+++ b/packages/core/saved-objects/core-saved-objects-api-server-internal/src/index.ts
@@ -7,11 +7,5 @@
  */
 
 export { SavedObjectsClient } from './saved_objects_client';
-export {
-  getRootFields,
-  type RootField,
-  SavedObjectsClientProvider,
-  SavedObjectsRepository,
-  PointInTimeFinder,
-} from './lib';
+export { SavedObjectsClientProvider, SavedObjectsRepository, PointInTimeFinder } from './lib';
 export type { ISavedObjectsClientProvider } from './lib';
diff --git a/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/index.ts b/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/index.ts
index 512f4f72082cb..cfe52298c7386 100644
--- a/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/index.ts
+++ b/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/index.ts
@@ -10,4 +10,3 @@ export { SavedObjectsRepository } from './repository';
 export { SavedObjectsClientProvider } from './scoped_client_provider';
 export { PointInTimeFinder } from './point_in_time_finder';
 export type { ISavedObjectsClientProvider } from './scoped_client_provider';
-export { getRootFields, type RootField } from './utils/included_fields';
diff --git a/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/utils/included_fields.ts b/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/utils/included_fields.ts
index 897c82b2ea442..50686def81c88 100644
--- a/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/utils/included_fields.ts
+++ b/packages/core/saved-objects/core-saved-objects-api-server-internal/src/lib/utils/included_fields.ts
@@ -18,11 +18,9 @@ const ROOT_FIELDS = [
   'updated_at',
   'created_at',
   'originId',
-] as const;
+];
 
-export type RootField = typeof ROOT_FIELDS[number];
-
-export function getRootFields(): string[] {
+export function getRootFields() {
   return [...ROOT_FIELDS];
 }
 
diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/core/build_active_mappings.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/core/build_active_mappings.ts
index 3ba5a52a117d9..72b06507ec402 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/core/build_active_mappings.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/core/build_active_mappings.ts
@@ -12,15 +12,11 @@
 
 import crypto from 'crypto';
 import { cloneDeep, mapValues } from 'lodash';
-import type {
-  SavedObjectsFieldMapping,
-  SavedObjectsMappingProperties,
-} from '@kbn/core-saved-objects-server';
+import type { SavedObjectsMappingProperties } from '@kbn/core-saved-objects-server';
 import type {
   IndexMapping,
   SavedObjectsTypeMappingDefinitions,
 } from '@kbn/core-saved-objects-base-server-internal';
-import type { RootField } from '@kbn/core-saved-objects-api-server-internal';
 
 /**
  * Creates an index mapping with the core properties required by saved object
@@ -140,9 +136,7 @@ function findChangedProp(actual: any, expected: any) {
  * @returns {IndexMapping}
  */
 export function getBaseMappings(): IndexMapping {
-  const baseMappings: IndexMapping & {
-    properties: Partial<Record<RootField, SavedObjectsFieldMapping>>;
-  } = {
+  return {
     dynamic: 'strict',
     properties: {
       type: {
@@ -188,8 +182,6 @@ export function getBaseMappings(): IndexMapping {
       },
     },
   };
-
-  return baseMappings;
 }
 
 function validateAndMerge(
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 edf426d7be973..382eedfe0c2d8 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
@@ -7,6 +7,7 @@
  */
 
 import { FetchIndexResponse } from '../actions/fetch_indices';
+import { BaseState } from '../state';
 import {
   addExcludedTypesToBoolQuery,
   addMustClausesToBoolQuery,
@@ -20,6 +21,7 @@ import {
   createBulkIndexOperationTuple,
   hasLaterVersionAlias,
   aliasVersion,
+  getIndexTypes,
 } from './helpers';
 
 describe('addExcludedTypesToBoolQuery', () => {
@@ -444,3 +446,17 @@ describe('getTempIndexName', () => {
     expect(getTempIndexName('.kibana_cases', '8.8.0')).toEqual('.kibana_cases_8.8.0_reindex_temp');
   });
 });
+
+describe('getIndexTypes', () => {
+  it("returns the list of types that belong to a migrator's index, based on its state", () => {
+    const baseState = {
+      indexPrefix: '.kibana_task_manager',
+      indexTypesMap: {
+        '.kibana': ['foo', 'bar'],
+        '.kibana_task_manager': ['task'],
+      },
+    };
+
+    expect(getIndexTypes(baseState as unknown as BaseState)).toEqual(['task']);
+  });
+});
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 d3e8fcabfc432..4588c6639d883 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
@@ -17,7 +17,7 @@ import type { SavedObjectsRawDoc } from '@kbn/core-saved-objects-server';
 import type { IndexMapping } from '@kbn/core-saved-objects-base-server-internal';
 import type { AliasAction, FetchIndexResponse } from '../actions';
 import type { BulkIndexOperationTuple } from './create_batches';
-import { OutdatedDocumentsSearchRead, ReindexSourceToTempRead } from '../state';
+import type { BaseState, OutdatedDocumentsSearchRead, ReindexSourceToTempRead } from '../state';
 
 /** @internal */
 export const REINDEX_TEMP_SUFFIX = '_reindex_temp';
@@ -323,3 +323,7 @@ export const increaseBatchSize = (
   const increasedBatchSize = Math.floor(stateP.batchSize * 1.2);
   return increasedBatchSize > stateP.maxBatchSize ? stateP.maxBatchSize : increasedBatchSize;
 };
+
+export const getIndexTypes = (state: BaseState): string[] => {
+  return state.indexTypesMap[state.indexPrefix];
+};
diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.test.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.test.ts
index 5fbd8a42d2e1a..60a7dbe7f11aa 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.test.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.test.ts
@@ -2616,7 +2616,7 @@ describe('migrations v2 model', () => {
         it('CHECK_TARGET_MAPPINGS -> UPDATE_TARGET_MAPPINGS_PROPERTIES if mappings do not match', () => {
           const res: ResponseType<'CHECK_TARGET_MAPPINGS'> = Either.right({
             match: false,
-            updatedHashes: ['type1', 'type2'],
+            updatedHashes: ['dashboard', 'lens'],
           });
           const newState = model(
             checkTargetMappingsState,
@@ -2630,12 +2630,12 @@ describe('migrations v2 model', () => {
               should: [
                 {
                   term: {
-                    type: 'type1',
+                    type: 'dashboard',
                   },
                 },
                 {
                   term: {
-                    type: 'type2',
+                    type: 'lens',
                   },
                 },
               ],
@@ -2646,7 +2646,7 @@ describe('migrations v2 model', () => {
         it('CHECK_TARGET_MAPPINGS -> UPDATE_TARGET_MAPPINGS_PROPERTIES if core fields have been updated', () => {
           const res: ResponseType<'CHECK_TARGET_MAPPINGS'> = Either.right({
             match: false,
-            updatedHashes: ['type1', 'type2', 'namespaces'], // 'namespaces' is a root field (core, common to all SOs)
+            updatedHashes: ['dashboard', 'lens', 'namespaces'], // 'namespaces' is a root field (core, common to all SOs)
           });
           const newState = model(
             checkTargetMappingsState,
diff --git a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts
index e0ab2e22fd30b..9da3ba19fcd4e 100644
--- a/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts
+++ b/packages/core/saved-objects/core-saved-objects-migration-server-internal/src/model/model.ts
@@ -9,7 +9,6 @@
 import * as Either from 'fp-ts/lib/Either';
 import * as Option from 'fp-ts/lib/Option';
 import type { IndexMapping } from '@kbn/core-saved-objects-base-server-internal';
-import { getRootFields } from '@kbn/core-saved-objects-api-server-internal';
 
 import { isTypeof } from '../actions';
 import type { AliasAction } from '../actions';
@@ -48,6 +47,7 @@ import {
   hasLaterVersionAlias,
   aliasVersion,
   REINDEX_TEMP_SUFFIX,
+  getIndexTypes,
 } from './helpers';
 import { buildTempIndexMap, createBatches } from './create_batches';
 import type { MigrationLog } from '../types';
@@ -1425,10 +1425,12 @@ export const model = (currentState: State, resW: ResponseType<AllActionStates>):
     if (Either.isRight(res)) {
       if (!res.right.match) {
         if (res.right.updatedHashes?.length) {
-          const updatedRootFields = res.right.updatedHashes.filter((field) =>
-            getRootFields().includes(field)
+          const typeFields = getIndexTypes(stateP);
+          const nonTypeFields = res.right.updatedHashes.filter(
+            (field) => !typeFields.includes(field)
           );
-          if (updatedRootFields.length) {
+          console.log('TYPE vs NON_TYPE', typeFields, nonTypeFields);
+          if (nonTypeFields.length) {
             return {
               ...stateP,
               controlState: 'UPDATE_TARGET_MAPPINGS_PROPERTIES',
@@ -1437,7 +1439,7 @@ export const model = (currentState: State, resW: ResponseType<AllActionStates>):
                 ...stateP.logs,
                 {
                   level: 'info',
-                  message: `Kibana is performing a compatible update and some root fields have been updated. All SO documents must be updated. Updated root fields: ${updatedRootFields}.`,
+                  message: `Kibana is performing a compatible update and some root fields have been updated. All SO documents must be updated. Updated root fields: ${nonTypeFields}.`,
                 },
               ],
             };