From d2070ca7242a832c158d9a8dd4edcc8bd806649a Mon Sep 17 00:00:00 2001
From: Nicolas Chaulet <nicolas.chaulet@elastic.co>
Date: Mon, 10 Feb 2025 08:00:59 -0500
Subject: [PATCH] [Fleet] Fix source mode synthetics when handling experimental
 datastream features (#210195)

---
 .../experimental_datastream_features.test.ts  | 12 ++++++++--
 .../experimental_datastream_features.ts       | 23 ++++++++++++++-----
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.test.ts b/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.test.ts
index a7c42de2a3ae2..17bc3fd4b98f2 100644
--- a/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.test.ts
+++ b/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.test.ts
@@ -271,7 +271,11 @@ describe('experimental_datastream_features', () => {
         expect.objectContaining({
           body: expect.objectContaining({
             template: expect.objectContaining({
-              mappings: expect.objectContaining({ _source: { mode: 'synthetic' } }),
+              settings: expect.objectContaining({
+                index: expect.objectContaining({
+                  mapping: expect.objectContaining({ source: { mode: 'synthetic' } }),
+                }),
+              }),
             }),
           }),
           _meta: { has_experimental_data_stream_indexing_features: true },
@@ -483,7 +487,11 @@ describe('experimental_datastream_features', () => {
           expect.objectContaining({
             body: expect.objectContaining({
               template: expect.objectContaining({
-                mappings: expect.objectContaining({ _source: { mode: 'synthetic' } }),
+                settings: expect.objectContaining({
+                  index: expect.objectContaining({
+                    mapping: expect.objectContaining({ source: { mode: 'synthetic' } }),
+                  }),
+                }),
               }),
             }),
             _meta: { has_experimental_data_stream_indexing_features: true },
diff --git a/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.ts b/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.ts
index cd1c26942aa0c..0877f38293f4e 100644
--- a/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.ts
+++ b/x-pack/platform/plugins/shared/fleet/server/services/package_policies/experimental_datastream_features.ts
@@ -155,21 +155,32 @@ export async function handleExperimentalDatastreamFeatureOptIn({
     });
 
     if (isSyntheticSourceOptInChanged) {
-      sourceModeSettings = {
-        _source: {
-          ...(featureMapEntry.features.synthetic_source ? { mode: 'synthetic' } : {}),
-        },
-      };
+      sourceModeSettings = featureMapEntry.features.synthetic_source
+        ? {
+            source: {
+              mode: 'synthetic',
+            },
+          }
+        : {};
     }
 
     if (componentTemplateChanged) {
       const body = {
         template: {
           ...componentTemplate.template,
+          settings: {
+            ...componentTemplate.template?.settings,
+            index: {
+              ...componentTemplate.template?.settings?.index,
+              mapping: {
+                ...componentTemplate.template?.settings?.index?.mapping,
+                ...sourceModeSettings,
+              },
+            },
+          },
           mappings: {
             ...mappings,
             properties: mappingsProperties ?? {},
-            ...sourceModeSettings,
           },
         },
       };