Fix documentMigrator for snapshot releases (#89936)

src/core/server/saved_objects/migrations/kibana/kibana_migrator.test.ts

@@ -14,6 +14,16 @@ import { loggingSystemMock } from '../../../logging/logging_system.mock';
 import { SavedObjectTypeRegistry } from '../../saved_objects_type_registry';
 import { SavedObjectsType } from '../../types';
 import { errors as esErrors } from '@elastic/elasticsearch';
+import { DocumentMigrator } from '../core/document_migrator';
+jest.mock('../core/document_migrator', () => {
+  return {
+    // Create a mock for spying on the constructor
+    DocumentMigrator: jest.fn().mockImplementation((...args) => {
+      const { DocumentMigrator: RealDocMigrator } = jest.requireActual('../core/document_migrator');
+      return new RealDocMigrator(args[0]);
+    }),
+  };
+});
 
 const createRegistry = (types: Array<Partial<SavedObjectsType>>) => {
   const registry = new SavedObjectTypeRegistry();
@@ -31,12 +41,16 @@ const createRegistry = (types: Array<Partial<SavedObjectsType>>) => {
 };
 
 describe('KibanaMigrator', () => {
+  beforeEach(() => {
+    (DocumentMigrator as jest.Mock).mockClear();
+  });
   describe('constructor', () => {
     it('coerces the current Kibana version if it has a hyphen', () => {
       const options = mockOptions();
       options.kibanaVersion = '3.2.1-SNAPSHOT';
       const migrator = new KibanaMigrator(options);
       expect(migrator.kibanaVersion).toEqual('3.2.1');
+      expect((DocumentMigrator as jest.Mock).mock.calls[0][0].kibanaVersion).toEqual('3.2.1');
     });
   });
   describe('getActiveMappings', () => {

src/core/server/saved_objects/migrations/kibana/kibana_migrator.ts

@@ -97,7 +97,7 @@ export class KibanaMigrator {
     this.log = logger;
     this.kibanaVersion = kibanaVersion.split('-')[0]; // coerce a semver-like string (x.y.z-SNAPSHOT) or prerelease version (x.y.z-alpha) to a regular semver (x.y.z);
     this.documentMigrator = new DocumentMigrator({
-      kibanaVersion,
+      kibanaVersion: this.kibanaVersion,
       typeRegistry,
       log: this.log,
     });