Use shipper as indexClient for read mode. (#6461)

pkg/loki/modules.go

@@ -490,7 +490,8 @@ func (t *Loki) initStore() (_ services.Service, err error) {
 			// Use AsyncStore to query both ingesters local store and chunk store for store queries.
 			// Only queriers should use the AsyncStore, it should never be used in ingesters.
 			asyncStore = true
-		case t.Cfg.isModuleEnabled(IndexGateway):
+			fallthrough
+		case t.Cfg.isModuleEnabled(IndexGateway) || t.Cfg.isModuleEnabled(Read):
 			// we want to use the actual storage when running the index-gateway, so we remove the Addr from the config
 			t.Cfg.StorageConfig.BoltDBShipperConfig.IndexGatewayClientConfig.Disabled = true
 			t.Cfg.StorageConfig.TSDBShipperConfig.IndexGatewayClientConfig.Disabled = true