script_fields not work after upgrade to kuzzle version 2

After upgrade kuzzle from 1 to version 2, script_fields stop to work. To reproduce if enough execute this query

{
	"script_fields": {
		"test1": {
			"script": {
				"lang": "painless",
				"source": "doc['Your Variable'].value"
			}
		}
	},
	"query": {}
}

Cannot get “test1” in the result but only the normal query.

{
	"requestId": "c020782d-1a56-49c3-b585-36f74e01ab4e",
	"status": 200,
	"error": null,
	"controller": "document",
	"action": "search",
	"collection": "asd",
	"index": "asd",
	"volatile": null,
	"result": {
		"hits": [{
				"_id": "yTRD1G4BC56TnFTJHsph",
				"_score": 1,
				"_source": {
					"asd": "ppippo",
					"_kuzzle_info": {
						"author": "-1",
						"createdAt": 1575519198812,
						"updatedAt": null,
						"updater": null
					}
				}
			}
		],
		"total": 1
	}
}

Elasticsearch is 7.4
kuzzle v2

In kuzzle v1 it works fine, any idea?

[cklinx]

Really thanks guys! With your examples its works!

[Aschen]

You also have a complete example of a controller route using the ESClient in the functional tests:

• https://github.com/kuzzleio/kuzzle/blob/master/plugins/available/functional-test-plugin/index.js#L11
• https://github.com/kuzzleio/kuzzle/blob/master/plugins/available/functional-test-plugin/index.js#L52