Speed up spaces tests by letting v2 migrations do less work (#91829)

* Don't mess with v2 migration's index

* Speed up spaces tests by letting v2 migrations do less work

* Add disabled mapping for spaces so that plugin can be disabled

* Add security as codeowners of xpack saved object api integration suite

.github/CODEOWNERS

@@ -251,6 +251,7 @@ x-pack/plugins/telemetry_collection_xpack/schema/ @elastic/kibana-core @elastic/
 /x-pack/test/security_api_integration/ @elastic/kibana-security
 /x-pack/test/security_functional/ @elastic/kibana-security
 /x-pack/test/spaces_api_integration/ @elastic/kibana-security
+/x-pack/test/saved_object_api_integration/ @elastic/kibana-security
 #CC# /x-pack/plugins/security/ @elastic/kibana-security
 
 # Kibana Alerting Services

packages/kbn-es-archiver/src/lib/indices/kibana_index.ts

@@ -57,20 +57,6 @@ export async function migrateKibanaIndex({
   client: Client;
   kbnClient: KbnClient;
 }) {
-  // we allow dynamic mappings on the index, as some interceptors are accessing documents before
-  // the migration is actually performed. The migrator will put the value back to `strict` after migration.
-  await client.indices.putMapping(
-    {
-      index: '.kibana',
-      body: {
-        dynamic: true,
-      },
-    },
-    {
-      ignore: [404],
-    }
-  );
-
   await kbnClient.savedObjects.migrate();
 }