Elasticsearch: Add feature toggle for backend migration (#58585)

* Elasticsearch: Add feature toggle for backend migration

* Update

packages/grafana-data/src/types/featureToggles.gen.ts

@@ -80,4 +80,5 @@ export interface FeatureToggles {
   datasourceLogger?: boolean;
   accessControlOnCall?: boolean;
   nestedFolders?: boolean;
+  elasticsearchBackendMigration?: boolean;
 }

pkg/services/featuremgmt/registry.go

@@ -357,5 +357,10 @@ var (
 			State:           FeatureStateAlpha,
 			RequiresDevMode: true,
 		},
+		{
+			Name:        "elasticsearchBackendMigration",
+			Description: "Use Elasticsearch as backend data source",
+			State:       FeatureStateAlpha,
+		},
 	}
 )

pkg/services/featuremgmt/toggles_gen.go

@@ -262,4 +262,8 @@ const (
 	// FlagNestedFolders
 	// Enable folder nesting
 	FlagNestedFolders = "nestedFolders"
+
+	// FlagElasticsearchBackendMigration
+	// Use Elasticsearch as backend data source
+	FlagElasticsearchBackendMigration = "elasticsearchBackendMigration"
 )