diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts
index 348c4838154f18..5f9e0a08065c4a 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/signal_rule_alert_type.test.ts
@@ -31,7 +31,6 @@ import { listMock } from '../../../../../lists/server/mocks';
 import { getListClientMock } from '../../../../../lists/server/services/lists/list_client.mock';
 import { getExceptionListClientMock } from '../../../../../lists/server/services/exception_lists/exception_list_client.mock';
 import { getExceptionListItemSchemaMock } from '../../../../../lists/common/schemas/response/exception_list_item_schema.mock';
-import { SingleBulkCreateResponse } from './single_bulk_create';
 
 jest.mock('./rule_status_saved_objects_client');
 jest.mock('./rule_status_service');
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/single_bulk_create.test.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/single_bulk_create.test.ts
index 41c825ea4d9787..374b967d1e77f0 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/single_bulk_create.test.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/single_bulk_create.test.ts
@@ -252,11 +252,11 @@ describe('singleBulkCreate', () => {
     expect(createdItemsCount).toEqual(1);
   });
 
-  test('create successful bulk create when bulk create has multiple error statuses', async () => {
+  test('create failed bulk create when bulk create has multiple error statuses', async () => {
     const sampleParams = sampleRuleAlertParams();
     const sampleSearchResult = sampleDocSearchResultsNoSortId;
     mockService.callCluster.mockResolvedValue(sampleBulkCreateErrorResult);
-    const { success, createdItemsCount } = await singleBulkCreate({
+    const { success, createdItemsCount, errors } = await singleBulkCreate({
       filteredEvents: sampleSearchResult(),
       ruleParams: sampleParams,
       services: mockService,
@@ -275,9 +275,9 @@ describe('singleBulkCreate', () => {
       tags: ['some fake tag 1', 'some fake tag 2'],
       throttle: 'no_actions',
     });
-
     expect(mockLogger.error).toHaveBeenCalled();
-    expect(success).toEqual(true);
+    expect(errors).toEqual(['[4]: internal server error']);
+    expect(success).toEqual(false);
     expect(createdItemsCount).toEqual(1);
   });
 
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/types.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/types.ts
index 700a8fb5022d72..b101bc57547640 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/types.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/types.ts
@@ -58,7 +58,7 @@ export interface SignalSource {
 }
 
 export interface BulkItem {
-  create: {
+  create?: {
     _index: string;
     _type?: string;
     _id: string;
diff --git a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/utils.ts b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/utils.ts
index dc09c6d5386fce..92d80d29775604 100644
--- a/x-pack/plugins/security_solution/server/lib/detection_engine/signals/utils.ts
+++ b/x-pack/plugins/security_solution/server/lib/detection_engine/signals/utils.ts
@@ -300,7 +300,7 @@ export const errorAggregator = (
   ignoreStatusCodes: number[]
 ): BulkResponseErrorAggregation => {
   return response.items.reduce<BulkResponseErrorAggregation>((accum, item) => {
-    if (item.create.error != null && !ignoreStatusCodes.includes(item.create.status)) {
+    if (item.create?.error != null && !ignoreStatusCodes.includes(item.create.status)) {
       if (accum[item.create.error.reason] == null) {
         accum[item.create.error.reason] = {
           count: 1,