Change the default max threads to something more reasonable

src/cpp/server/server_cc.cc

@@ -48,10 +48,10 @@ namespace grpc {
 namespace {
 
 // The default value for maximum number of threads that can be created in the
-// sync server. This value of 1500 is empirically chosen. To increase the max
+// sync server. This value of 500 is empirically chosen. To increase the max
 // number of threads in a sync server, pass a custom ResourceQuota object (with
 // the desired number of max-threads set) to the server builder
-#define DEFAULT_MAX_SYNC_SERVER_THREADS 1500
+#define DEFAULT_MAX_SYNC_SERVER_THREADS 500
 
 class DefaultGlobalCallbacks final : public Server::GlobalCallbacks {
  public: