Set a low Java heap size in development

environments/development.json

@@ -8,6 +8,11 @@
   "override_attributes": {
     "kosmos-parity": {
       "debian_package_dir": "/vagrant"
+    },
+    "kosmos-mastodon": {
+      "elasticsearch": {
+        "allocated_memory": "128m"
+      }
     }
   }
 }