Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/store/searchlayer/layer_test.go

@@ -0,0 +1,45 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package searchlayer_test
+
+import (
+	"os"
+	"sync"
+	"testing"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/store/searchlayer"
+	"github.com/mattermost/mattermost-server/v6/server/channels/store/sqlstore"
+	"github.com/mattermost/mattermost-server/v6/server/channels/store/storetest"
+	"github.com/mattermost/mattermost-server/v6/server/channels/testlib"
+	"github.com/mattermost/mattermost-server/v6/server/platform/services/searchengine"
+)
+
+// Test to verify race condition on UpdateConfig. The test must run with -race flag in order to verify
+// that there is no race. Ref: (#MM-30868)
+func TestUpdateConfigRace(t *testing.T) {
+	driverName := os.Getenv("MM_SQLSETTINGS_DRIVERNAME")
+	if driverName == "" {
+		driverName = model.DatabaseDriverPostgres
+	}
+	settings := storetest.MakeSqlSettings(driverName, false)
+	store := sqlstore.New(*settings, nil)
+
+	cfg := &model.Config{}
+	cfg.SetDefaults()
+	cfg.ClusterSettings.MaxIdleConns = model.NewInt(1)
+	searchEngine := searchengine.NewBroker(cfg)
+	layer := searchlayer.NewSearchLayer(&testlib.TestStore{Store: store}, searchEngine, cfg)
+	var wg sync.WaitGroup
+
+	wg.Add(5)
+	for i := 0; i < 5; i++ {
+		go func() {
+			defer wg.Done()
+			layer.UpdateConfig(cfg.Clone())
+		}()
+	}
+
+	wg.Wait()
+}