diff --git a/x-pack/plugins/enterprise_search/public/applications/shared/flash_messages/handle_api_errors.ts b/x-pack/plugins/enterprise_search/public/applications/shared/flash_messages/handle_api_errors.ts
index 11003d0fcc171..47ee2d2a3bcae 100644
--- a/x-pack/plugins/enterprise_search/public/applications/shared/flash_messages/handle_api_errors.ts
+++ b/x-pack/plugins/enterprise_search/public/applications/shared/flash_messages/handle_api_errors.ts
@@ -31,12 +31,13 @@ interface Options {
   isQueued?: boolean;
 }
 
+// TODO I know our error messages from the BE are not i18n-ized but should this be?
+export const defaultErrorMessage = 'An unexpected error occurred';
+
 /**
  * Converts API/HTTP errors into user-facing Flash Messages
  */
 export const flashAPIErrors = (error: HttpResponse<ErrorResponse>, { isQueued }: Options = {}) => {
-  const defaultErrorMessage = 'An unexpected error occurred';
-
   const errorFlashMessages: IFlashMessage[] = Array.isArray(error?.body?.attributes?.errors)
     ? error.body!.attributes.errors.map((message) => ({ type: 'error', message }))
     : [{ type: 'error', message: error?.body?.message || defaultErrorMessage }];
diff --git a/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.test.ts b/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.test.ts
index fd1a574b3438f..3e8322145dad6 100644
--- a/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.test.ts
+++ b/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.test.ts
@@ -27,6 +27,7 @@ const spyScrollTo = jest.fn();
 Object.defineProperty(global.window, 'scrollTo', { value: spyScrollTo });
 
 import { ADD, UPDATE } from '../../../../../shared/constants/operations';
+import { defaultErrorMessage } from '../../../../../shared/flash_messages/handle_api_errors';
 import { SchemaType } from '../../../../../shared/schema/types';
 import { AppLogic } from '../../../../app_logic';
 
@@ -390,13 +391,25 @@ describe('SchemaLogic', () => {
           expect(onSchemaSetSuccessSpy).toHaveBeenCalledWith(serverResponse);
         });
 
-        it('handles error', async () => {
+        it('handles error with message', async () => {
+          const onSchemaSetFormErrorsSpy = jest.spyOn(SchemaLogic.actions, 'onSchemaSetFormErrors');
+          // We expect body.message to be a string[] when it is present
+          http.post.mockReturnValue(Promise.reject({ body: { message: ['this is an error'] } }));
+          SchemaLogic.actions.setServerField(schema, ADD);
+          await nextTick();
+
+          expect(onSchemaSetFormErrorsSpy).toHaveBeenCalledWith(['this is an error']);
+          expect(spyScrollTo).toHaveBeenCalledWith(0, 0);
+        });
+
+        it('handles error with no message', async () => {
           const onSchemaSetFormErrorsSpy = jest.spyOn(SchemaLogic.actions, 'onSchemaSetFormErrors');
-          http.post.mockReturnValue(Promise.reject({ message: 'this is an error' }));
+          http.post.mockReturnValue(Promise.reject());
           SchemaLogic.actions.setServerField(schema, ADD);
           await nextTick();
 
-          expect(onSchemaSetFormErrorsSpy).toHaveBeenCalledWith('this is an error');
+          expect(onSchemaSetFormErrorsSpy).toHaveBeenCalledWith([defaultErrorMessage]);
+          expect(spyScrollTo).toHaveBeenCalledWith(0, 0);
         });
       });
 
diff --git a/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.ts b/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.ts
index b63c4d910a825..7af074d412a60 100644
--- a/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.ts
+++ b/x-pack/plugins/enterprise_search/public/applications/workplace_search/views/content_sources/components/schema/schema_logic.ts
@@ -17,6 +17,7 @@ import {
   setErrorMessage,
   clearFlashMessages,
 } from '../../../../../shared/flash_messages';
+import { defaultErrorMessage } from '../../../../../shared/flash_messages/handle_api_errors';
 import { HttpLogic } from '../../../../../shared/http';
 import {
   IndexJob,
@@ -349,7 +350,9 @@ export const SchemaLogic = kea<MakeLogicType<SchemaValues, SchemaActions>>({
       } catch (e) {
         window.scrollTo(0, 0);
         if (isAdding) {
-          actions.onSchemaSetFormErrors(e?.body?.message);
+          // We expect body.message to be a string[] for actions.onSchemaSetFormErrors
+          const message: string[] = e?.body?.message || [defaultErrorMessage];
+          actions.onSchemaSetFormErrors(message);
         } else {
           flashAPIErrors(e);
         }