[8.19] Fix ignored dynamic templates (elastic#219875) (elastic#219899)

# Backport

This will backport the following commits from `main` to `8.19`:
- [Fix ignored dynamic templates
(elastic#219875)](elastic#219875)

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

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

<!--BACKPORT [{"author":{"name":"Ersin
Erdal","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-05-02T08:28:56Z","message":"Fix
ignored dynamic templates (elastic#219875)\n\nThis PR fixes the bug introduced
with:\nhttps://github.com/elastic/pull/216719\n\nWe didn't pass
the dynamic_templates param while creating the component\ntemplate.\nThe
fields were still being added because the fields were marked
as\n`dynamic: true`\n\nAs the dynamic_template was ignored, the fields
were added with an extra\nmapping like `filedname.keyword`\nThis PR
fixes that too.\n\n---------\n\nCo-authored-by: kibanamachine
<[email protected]>","sha":"8c6c928e7cde2233da4145c6e712785acf54c5f9","branchLabelMapping":{"^v9.1.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:fix","Team:ResponseOps","v9.0.0","backport:version","v9.1.0","v8.19.0","v9.0.1","v9.0.2"],"title":"Fix
ignored dynamic
templates","number":219875,"url":"https://github.com/elastic/kibana/pull/219875","mergeCommit":{"message":"Fix
ignored dynamic templates (elastic#219875)\n\nThis PR fixes the bug introduced
with:\nhttps://github.com/elastic/pull/216719\n\nWe didn't pass
the dynamic_templates param while creating the component\ntemplate.\nThe
fields were still being added because the fields were marked
as\n`dynamic: true`\n\nAs the dynamic_template was ignored, the fields
were added with an extra\nmapping like `filedname.keyword`\nThis PR
fixes that too.\n\n---------\n\nCo-authored-by: kibanamachine
<[email protected]>","sha":"8c6c928e7cde2233da4145c6e712785acf54c5f9"}},"sourceBranch":"main","suggestedTargetBranches":["9.0","8.19"],"targetPullRequestStates":[{"branch":"9.0","label":"v9.0.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v9.1.0","branchLabelMappingKey":"^v9.1.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/219875","number":219875,"mergeCommit":{"message":"Fix
ignored dynamic templates (elastic#219875)\n\nThis PR fixes the bug introduced
with:\nhttps://github.com/elastic/pull/216719\n\nWe didn't pass
the dynamic_templates param while creating the component\ntemplate.\nThe
fields were still being added because the fields were marked
as\n`dynamic: true`\n\nAs the dynamic_template was ignored, the fields
were added with an extra\nmapping like `filedname.keyword`\nThis PR
fixes that too.\n\n---------\n\nCo-authored-by: kibanamachine
<[email protected]>","sha":"8c6c928e7cde2233da4145c6e712785acf54c5f9"}},{"branch":"8.19","label":"v8.19.0","branchLabelMappingKey":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

---------

Co-authored-by: Ersin Erdal <[email protected]>
Co-authored-by: Ersin Erdal <[email protected]>

Author: kibanamachine

x-pack/platform/plugins/shared/alerting/server/alerts_service/alerts_service.test.ts

@@ -708,6 +708,37 @@ describe('Alerts Service', () => {
           }
         });
 
+        test('should save the dynamic_templates', async () => {
+          const dynamicTemplates = [
+            {
+              strings_as_keywords: {
+                path_match: 'test-path',
+                match_mapping_type: 'string',
+                mapping: {
+                  type: 'keyword',
+                  ignore_above: 1024,
+                },
+              },
+            },
+          ] satisfies IRuleTypeAlerts['mappings']['dynamicTemplates'];
+
+          alertsService.register({
+            ...TestRegistrationContext,
+            mappings: {
+              ...TestRegistrationContext.mappings,
+              dynamicTemplates,
+            },
+          });
+          await retryUntil(
+            'context initialized',
+            async () => (await getContextInitialized(alertsService)) === true
+          );
+
+          const componentTemplate = clusterClient.cluster.putComponentTemplate.mock.calls[3][0];
+          // @ts-ignore
+          expect(componentTemplate.template.mappings?.dynamic_templates).toEqual(dynamicTemplates);
+        });
+
         test('should correctly install resources for custom namespace on demand when isSpaceAware is true', async () => {
           alertsService.register({ ...TestRegistrationContext, isSpaceAware: true });
           await retryUntil(

x-pack/platform/plugins/shared/alerting/server/alerts_service/alerts_service.ts

@@ -432,6 +432,7 @@ export class AlertsService implements IAlertsService {
       const componentTemplate = getComponentTemplate({
         fieldMap: mappings.fieldMap,
         dynamic: mappings.dynamic,
+        dynamicTemplates: mappings.dynamicTemplates,
         context,
       });
       initFns.push(

x-pack/test/alerting_api_integration/spaces_only/tests/alerting/group4/alerts_as_data/alerts_as_data_dynamic_templates.ts

@@ -73,7 +73,7 @@ export default function createAlertsAsDataDynamicTemplatesTest({ getService }: F
         // therefore we add 9 to get the real number.
         const nestedObjectsAndMultiFields = 9;
         // Number of free slots that we want to have, so we can add dynamic fields as many
-        const numberofFreeSlots = 3;
+        const numberofFreeSlots = 2;
         const totalFields =
           numberOfExistingFields + nestedObjectsAndMultiFields + numberofFreeSlots;
 
@@ -128,7 +128,7 @@ export default function createAlertsAsDataDynamicTemplatesTest({ getService }: F
         );
 
         // new dynamic field has been added
-        expect(dynamicField).to.eql('text');
+        expect(dynamicField).to.eql('keyword');
       });
     });