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/setting/setting.go

@@ -577,7 +577,6 @@ type Cfg struct {
 	IndexMaxBatchSize                          int
 	IndexFileThreshold                         int
 	IndexMinCount                              int
-	IndexMaxCount                              int
 	IndexRebuildInterval                       time.Duration
 	IndexCacheTTL                              time.Duration
 	EnableSharding                             bool

pkg/setting/setting_unified_storage.go

@@ -69,7 +69,6 @@ func (cfg *Cfg) setUnifiedStorageConfig() {
 	cfg.InstanceID = section.Key("instance_id").String()
 	cfg.IndexFileThreshold = section.Key("index_file_threshold").MustInt(10)
 	cfg.IndexMinCount = section.Key("index_min_count").MustInt(1)
-	cfg.IndexMaxCount = section.Key("index_max_count").MustInt(0)
 	// default to 24 hours because usage insights summarizes the data every 24 hours
 	cfg.IndexRebuildInterval = section.Key("index_rebuild_interval").MustDuration(24 * time.Hour)
 	cfg.IndexCacheTTL = section.Key("index_cache_ttl").MustDuration(10 * time.Minute)

pkg/setting/setting_unified_storage_test.go

@@ -35,9 +35,6 @@ func TestCfg_setUnifiedStorageConfig(t *testing.T) {
 		_, err = unifiedStorageSection.NewKey("index_min_count", "5")
 		assert.NoError(t, err)
 
-		_, err = unifiedStorageSection.NewKey("index_max_count", "1000")
-		assert.NoError(t, err)
-
 		cfg.setUnifiedStorageConfig()
 
 		value, exists := cfg.UnifiedStorage["playlists.playlist.grafana.app"]
@@ -52,7 +49,6 @@ func TestCfg_setUnifiedStorageConfig(t *testing.T) {
 
 		// Test that index settings are correctly parsed
 		assert.Equal(t, 5, cfg.IndexMinCount)
-		assert.Equal(t, 1000, cfg.IndexMaxCount)
 	})
 
 	t.Run("read unified_storage configs with defaults", func(t *testing.T) {
@@ -65,6 +61,5 @@ func TestCfg_setUnifiedStorageConfig(t *testing.T) {
 
 		// Test that default index settings are applied
 		assert.Equal(t, 1, cfg.IndexMinCount)
-		assert.Equal(t, 0, cfg.IndexMaxCount)
 	})
 }