[9.1] [Bug] Fixed content connector sync rules non interactive save button (#231555) (#231727)

# Backport

This will backport the following commits from `main` to `9.1`:
- [[Bug] Fixed content connector sync rules non interactive save button
(#231555)](#231555)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Yuliia
Naumenko","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-08-14T03:35:02Z","message":"[Bug]
Fixed content connector sync rules non interactive save button
(#231555)\n\n## Summary\n\nThis PR fixes the bug with saving sync
rules.\n\nBefore:\n\n\nhttps://github.com/user-attachments/assets/037f72c1-e570-4c79-a16a-a88d503aa08b\n\n\n\nAfter:\n\n\nhttps://github.com/user-attachments/assets/de937570-cc2c-4370-8c80-e7f1550465b6","sha":"fa4eed64b91724d01e3a78e24b1c360c269b7d09","branchLabelMapping":{"^v9.2.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["bug","release_note:skip","backport:version","v9.2.0","v9.1.3"],"title":"[Bug]
Fixed content connector sync rules non interactive save
button","number":231555,"url":"https://github.com/elastic/kibana/pull/231555","mergeCommit":{"message":"[Bug]
Fixed content connector sync rules non interactive save button
(#231555)\n\n## Summary\n\nThis PR fixes the bug with saving sync
rules.\n\nBefore:\n\n\nhttps://github.com/user-attachments/assets/037f72c1-e570-4c79-a16a-a88d503aa08b\n\n\n\nAfter:\n\n\nhttps://github.com/user-attachments/assets/de937570-cc2c-4370-8c80-e7f1550465b6","sha":"fa4eed64b91724d01e3a78e24b1c360c269b7d09"}},"sourceBranch":"main","suggestedTargetBranches":["9.1"],"targetPullRequestStates":[{"branch":"main","label":"v9.2.0","branchLabelMappingKey":"^v9.2.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/231555","number":231555,"mergeCommit":{"message":"[Bug]
Fixed content connector sync rules non interactive save button
(#231555)\n\n## Summary\n\nThis PR fixes the bug with saving sync
rules.\n\nBefore:\n\n\nhttps://github.com/user-attachments/assets/037f72c1-e570-4c79-a16a-a88d503aa08b\n\n\n\nAfter:\n\n\nhttps://github.com/user-attachments/assets/de937570-cc2c-4370-8c80-e7f1550465b6","sha":"fa4eed64b91724d01e3a78e24b1c360c269b7d09"}},{"branch":"9.1","label":"v9.1.3","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Yuliia Naumenko <[email protected]>

Author: kibanamachine

x-pack/platform/plugins/shared/content_connectors/public/components/connector_detail/connector_detail.tsx

@@ -162,32 +162,29 @@ export const ConnectorDetail: React.FC = () => {
   ];
 
   const CONNECTOR_TABS = [
-    ...(hasFilteringFeature
-      ? [
-          {
-            content: <ConnectorSyncRules />,
-            disabled: !index,
-            id: ConnectorDetailTabId.SYNC_RULES,
-            isSelected: tabId === ConnectorDetailTabId.SYNC_RULES,
-            label: i18n.translate(
-              'xpack.contentConnectors.connectors.connectorDetail.syncRulesTabLabel',
-              {
-                defaultMessage: 'Sync rules',
-              }
-            ),
-            onClick: () =>
-              application?.navigateToUrl(
-                generateEncodedPath(
-                  `/app/management/data/content_connectors${CONNECTOR_DETAIL_TAB_PATH}`,
-                  {
-                    connectorId,
-                    tabId: ConnectorDetailTabId.SYNC_RULES,
-                  }
-                )
-              ),
-          },
-        ]
-      : []),
+    {
+      content: <ConnectorSyncRules />,
+      disabled: !index || !hasFilteringFeature,
+      id: ConnectorDetailTabId.SYNC_RULES,
+      isSelected: tabId === ConnectorDetailTabId.SYNC_RULES,
+      label: i18n.translate(
+        'xpack.contentConnectors.connectors.connectorDetail.syncRulesTabLabel',
+        {
+          defaultMessage: 'Sync rules',
+        }
+      ),
+      onClick: () =>
+        application?.navigateToUrl(
+          generateEncodedPath(
+            `/app/management/data/content_connectors${CONNECTOR_DETAIL_TAB_PATH}`,
+            {
+              connectorId,
+              tabId: ConnectorDetailTabId.SYNC_RULES,
+            }
+          )
+        ),
+    },
+
     {
       content: <ConnectorScheduling />,
       disabled: !connector?.index_name,

x-pack/platform/plugins/shared/content_connectors/server/routes/connectors.ts

@@ -1188,7 +1188,7 @@ export function registerConnectorRoutes({
       try {
         const index = await fetchIndex(client.asCurrentUser, indexName);
         return response.ok({
-          body: index,
+          body: index?.index,
           headers: { 'content-type': 'application/json' },
         });
       } catch (error) {