Search: Add search index configuration options (#55525)

* Search: externalize config

* Search: update config descriptions

* Search: fix value

* Search: fix

* update

* Search: revert config values

* Search: rename copy/paste

* Search: fix tests

pkg/setting/setting_search.go

@@ -0,0 +1,23 @@
+package setting
+
+import (
+	"time"
+
+	"gopkg.in/ini.v1"
+)
+
+type SearchSettings struct {
+	FullReindexInterval       time.Duration
+	IndexUpdateInterval       time.Duration
+	DashboardLoadingBatchSize int
+}
+
+func readSearchSettings(iniFile *ini.File) SearchSettings {
+	s := SearchSettings{}
+
+	searchSection := iniFile.Section("search")
+	s.DashboardLoadingBatchSize = searchSection.Key("dashboard_loading_batch_size").MustInt(200)
+	s.FullReindexInterval = searchSection.Key("full_reindex_interval").MustDuration(5 * time.Minute)
+	s.IndexUpdateInterval = searchSection.Key("index_update_interval").MustDuration(10 * time.Second)
+	return s
+}