Resolved error Unknown modifier: $pushAll

adding this:

 mongoose.plugin(schema => { schema.options.usePushEach = true });

ecosystem.config.js

@@ -0,0 +1,17 @@
+module.exports = {
+  apps : [
+    {
+      name: "FreePlanetServerSide",
+      script: "./server/server.js",
+      watch: true,
+      env: {
+        "PORT": 3000,
+        "NODE_ENV": "development"
+      },
+      env_production: {
+        "PORT": 8080,
+        "NODE_ENV": "production",
+      }
+    }
+  ]
+}