Making private some sqlstore methods (#13895)

* Making private some sqlstore methods

* Calling for create indexes on missing stores

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

store/sqlstore/channel_store.go

@@ -290,7 +290,7 @@ func (s SqlChannelStore) ClearCaches() {
 	}
 }
 
-func NewSqlChannelStore(sqlStore SqlStore, metrics einterfaces.MetricsInterface) store.ChannelStore {
+func newSqlChannelStore(sqlStore SqlStore, metrics einterfaces.MetricsInterface) store.ChannelStore {
 	s := &SqlChannelStore{
 		SqlStore: sqlStore,
 		metrics:  metrics,
@@ -328,7 +328,7 @@ func NewSqlChannelStore(sqlStore SqlStore, metrics einterfaces.MetricsInterface)
 	return s
 }
 
-func (s SqlChannelStore) CreateIndexesIfNotExists() {
+func (s SqlChannelStore) createIndexesIfNotExists() {
 	s.CreateIndexIfNotExists("idx_channels_team_id", "Channels", "TeamId")
 	s.CreateIndexIfNotExists("idx_channels_name", "Channels", "Name")
 	s.CreateIndexIfNotExists("idx_channels_update_at", "Channels", "UpdateAt")