fix: crash when WITH_SEARCH=OFF (#5867)

Author: BorysTheDev

src/server/main_service.cc

@@ -970,7 +970,9 @@ void Service::Init(util::AcceptServer* acceptor, std::vector<facade::Listener*>
   config_registry.RegisterMutable("timeout");
   config_registry.RegisterMutable("send_timeout");
   config_registry.RegisterMutable("managed_service_info");
+#ifdef WITH_SEARCH
   config_registry.RegisterMutable("MAXSEARCHRESULTS");
+#endif
 
   config_registry.RegisterMutable(
       "notify_keyspace_events", [pool = &pp_](const absl::CommandLineFlag& flag) {