Nested fields are not displayed on Kibana

[Mayons95]

Wazuh	Elastic	Rev	Security
4.4	7.17.6, 7.16.3	Xpack

Browser
Chrome, Firefox

Description
Testing the feature implemented on PR #4428 I found that trying to open nested field using Kibana 7.17.6 an error it's displayed

Preconditions
It's needs to have alerts with nested fields

Steps to reproduce

1. Navigate to security events dashboard
2. Click on one alert that has nested fields

Expected Result

1. The alert should be displayed correctly

Actual Result

1. A error it's displayed

Screenshots

Screencast.from.18-11-22.15.10.38.webm

Additional context
Add any other context about the problem here. Here you can paste log entries too or any other useful information that may help with the issue.

[asteriscos]

Solution

formatHit is no longer a method of the IndexPattern class in Kibana 7.16+, so to detect if a field is known we have to use our own formatHit function in:
public/kibana-integrations/lib/format_hit.ts

And also enhance this function to detect if a field value is an array, so we can format it whether is known or not.