Lastly, we will set the object-specific additionalProperties keyword to false. This will reject objects that contain keys not already defined under properties (for example, isAdmin):

{
  "type": "object",
  "properties": {
    "bio": { "type": "string" },
    "summary": { "type": "string" },
    "name": { "type": "object" }
  },
  "additionalProperties": false
}

Having additionalProperties set to false is really important, especially for Elasticsearch. This is because Elasticsearch uses a technique called dynamic mapping to infer the data types of its documents, and uses it to generate its indexes.