Cleanup of old search functionality (#110861)

* Remove support for initMinSize.
Remove support for searchAfterWrite option, now it defaults to true.

* Remove reference to deprecated feature toggle.

* Remove feature toggle completely.

* Remove code related to indexing on watch events.

* Fix compilation error.

* Remove unused field.

pkg/services/featuremgmt/registry.go

@@ -1939,16 +1939,6 @@ var (
 			Owner:        grafanaPartnerPluginsSquad,
 			Expression:   "false",
 		},
-		{
-			Name:              "unifiedStorageSearchAfterWriteExperimentalAPI",
-			Description:       "Enable experimental search-after-write guarantees to unified-storage search endpoints",
-			Stage:             FeatureStageExperimental,
-			Owner:             grafanaSearchAndStorageSquad,
-			HideFromAdminPage: true,
-			HideFromDocs:      true,
-			RequiresRestart:   true,
-			Expression:        "false",
-		},
 		{
 			Name:         "teamFolders",
 			Description:  "Enables team folders functionality",

pkg/services/featuremgmt/toggles_gen.csv

@@ -249,7 +249,6 @@ adhocFiltersInTooltips,GA,@grafana/datapro,false,false,true
 favoriteDatasources,experimental,@grafana/plugins-platform-backend,false,false,true
 newLogContext,experimental,@grafana/observability-logs,false,false,true
 newClickhouseConfigPageDesign,privatePreview,@grafana/partner-datasources,false,false,false
-unifiedStorageSearchAfterWriteExperimentalAPI,experimental,@grafana/search-and-storage,false,true,false
 teamFolders,experimental,@grafana/grafana-search-navigate-organise,false,false,false
 alertingTriage,experimental,@grafana/alerting-squad,false,false,true
 graphiteBackendMode,privatePreview,@grafana/partner-datasources,false,false,false

pkg/services/featuremgmt/toggles_gen.go

@@ -1007,10 +1007,6 @@ const (
 	// Enables new design for the Clickhouse data source configuration page
 	FlagNewClickhouseConfigPageDesign = "newClickhouseConfigPageDesign"
 
-	// FlagUnifiedStorageSearchAfterWriteExperimentalAPI
-	// Enable experimental search-after-write guarantees to unified-storage search endpoints
-	FlagUnifiedStorageSearchAfterWriteExperimentalAPI = "unifiedStorageSearchAfterWriteExperimentalAPI"
-
 	// FlagTeamFolders
 	// Enables team folders functionality
 	FlagTeamFolders = "teamFolders"

pkg/services/featuremgmt/toggles_gen.json

@@ -3537,6 +3537,7 @@
         "name": "unifiedStorageSearchAfterWriteExperimentalAPI",
         "resourceVersion": "1755089543487",
         "creationTimestamp": "2025-08-13T14:05:15Z",
+        "deletionTimestamp": "2025-09-10T09:52:56Z",
         "annotations": {
           "grafana.app/updatedTimestamp": "2025-08-13 12:52:23.487521 +0000 UTC"
         }