search highlights gives uuids instead of ... highlights

[iamdey]

{
	"total": 2,
	"messages_hits": {
		"total": 0,
		"messages": []
	},
	"contact_hits": {
		"total": 2,
		"contacts": [{
			"id": "1bb147f7-385e-44a4-a480-d59069f1b19b",
			"score": 0,
			"highlights": {
				"user_id": ["\u003cem\u003e984375cc-37a4-4c30-ab20-82da3ef44917\u003c/em\u003e"]
			},
			"document": {
				"contact_id": "1bb147f7-385e-44a4-a480-d59069f1b19b",
				"date_insert": "2018-11-22T14:48:44.687Z",
				"date_update": "2018-11-22T14:48:44.687Z",
				"deleted": "0001-01-01T00:00:00Z",
				"user_id": "984375cc-37a4-4c30-ab20-82da3ef44917"
			}
		}, {
			"id": "ead42c55-3a90-4464-a8ea-3e03250c71b1",
			"score": 0,
			"highlights": {
				"user_id": ["\u003cem\u003e984375cc-37a4-4c30-ab20-82da3ef44917\u003c/em\u003e"]
			},
			"document": {
				"contact_id": "ead42c55-3a90-4464-a8ea-3e03250c71b1",
				"date_insert": "0001-01-01T00:00:00Z",
				"date_update": "0001-01-01T00:00:00Z",
				"deleted": "0001-01-01T00:00:00Z",
				"emails": [{
					"address": "azd",
					"email_id": "1e6ed91f-9bcf-4017-810d-2c0cf37b1d7d",
					"is_primary": false,
					"type": "other"
				}],
				"given_name": "dey",
				"title": "dey",
				"user_id": "984375cc-37a4-4c30-ab20-82da3ef44917"
			}
		}]
	}
}

same for messages and contacts: highlights are displayed on the client as it is in json

cf. #1099

[iamdey]

notice the \u003cem\u003e that represent the <em> tag