[9.0] [index mgmt] Fix preview of index templates which are used by data streams (#217604) (#217767)

mattkime · web-flow · commit 6503048db079 · 2025-04-10T07:56:25.000+02:00
# Backport This will backport the following commits from `main` to `9.0`: - [[index mgmt] Fix preview of index templates which are used by data streams (#217604)](#217604)  ### Questions ? Please refer to the [Backport tool documentation](https://github.com/sorenlouv/backport)
diff --git a/x-pack/platform/plugins/shared/index_management/server/routes/api/templates/register_simulate_route.ts b/x-pack/platform/plugins/shared/index_management/server/routes/api/templates/register_simulate_route.ts
@@ -40,7 +40,6 @@ export function registerSimulateRoute({ router, lib: { handleEsError } }: RouteD
       const params: estypes.IndicesSimulateTemplateRequest = templateName
         ? {
             name: templateName,
-            index_patterns,
           }
         : {
             ...template,
diff --git a/x-pack/test/api_integration/apis/management/index_management/templates.ts b/x-pack/test/api_integration/apis/management/index_management/templates.ts
@@ -521,6 +521,23 @@ export default function ({ getService }: FtrProviderContext) {
         // cleanup
         await deleteTemplates([{ name: templateName }]);
       });
+
+      it('should simulate an index template by name with a related data stream', async () => {
+        const dataStreamName = `test-foo`;
+        const templateName = `template-${getRandomString()}`;
+        const payload = getTemplatePayload(templateName);
+
+        await createTemplate({ ...payload, dataStream: {} }).expect(200);
+
+        // Matches index template
+        await es.indices.createDataStream({ name: dataStreamName });
+
+        await simulateTemplateByName(templateName).expect(200);
+
+        // cleanup
+        await deleteTemplates([{ name: templateName }]);
+        await es.indices.deleteDataStream({ name: dataStreamName });
+      });
     });
   });
 }

Original file line number	Diff line number	Diff line change
`@@ -40,7 +40,6 @@ export function registerSimulateRoute({ router, lib: { handleEsError } }: RouteD`
`40`	`40`	`const params: estypes.IndicesSimulateTemplateRequest = templateName`
`41`	`41`	`? {`
`42`	`42`	`name: templateName,`
`43`		`- index_patterns,`
`44`	`43`	`}`
`45`	`44`	`: {`
`46`	`45`	`...template,`