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();
 }