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 3e8322145dad6..d642900aea169 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
@@ -325,10 +325,11 @@ describe('SchemaLogic', () => {
       });
 
       it('handles duplicate', () => {
+        const onSchemaSetFormErrorsSpy = jest.spyOn(SchemaLogic.actions, 'onSchemaSetFormErrors');
         SchemaLogic.actions.onInitializeSchema(serverResponse);
         SchemaLogic.actions.addNewField('foo', SchemaType.Number);
 
-        expect(setErrorMessage).toHaveBeenCalledWith('New field already exists: foo.');
+        expect(onSchemaSetFormErrorsSpy).toHaveBeenCalledWith(['New field already exists: foo.']);
       });
     });
 
@@ -393,8 +394,10 @@ describe('SchemaLogic', () => {
 
         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'] } }));
+          // We expect body.attributes.errors to be a string[] when it is present
+          http.post.mockReturnValue(
+            Promise.reject({ body: { attributes: { errors: ['this is an error'] } } })
+          );
           SchemaLogic.actions.setServerField(schema, ADD);
           await nextTick();
 
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 7af074d412a60..f43be974102b2 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
@@ -301,15 +301,15 @@ export const SchemaLogic = kea<MakeLogicType<SchemaValues, SchemaActions>>({
     addNewField: ({ fieldName, newFieldType }) => {
       if (fieldName in values.activeSchema) {
         window.scrollTo(0, 0);
-        setErrorMessage(
+        actions.onSchemaSetFormErrors([
           i18n.translate(
             'xpack.enterpriseSearch.workplaceSearch.contentSource.schema.newFieldExists.message',
             {
               defaultMessage: 'New field already exists: {fieldName}.',
               values: { fieldName },
             }
-          )
-        );
+          ),
+        ]);
       } else {
         const schema = cloneDeep(values.activeSchema);
         schema[fieldName] = newFieldType;
@@ -350,8 +350,8 @@ export const SchemaLogic = kea<MakeLogicType<SchemaValues, SchemaActions>>({
       } catch (e) {
         window.scrollTo(0, 0);
         if (isAdding) {
-          // We expect body.message to be a string[] for actions.onSchemaSetFormErrors
-          const message: string[] = e?.body?.message || [defaultErrorMessage];
+          // We expect body.attributes.errors to be a string[] for actions.onSchemaSetFormErrors
+          const message: string[] = e?.body?.attributes?.errors || [defaultErrorMessage];
           actions.onSchemaSetFormErrors(message);
         } else {
           flashAPIErrors(e);