[Security Solution][Investigations][Tech Debt] - Timelines Template Documentation

[michaelolo24]

Background:

This issue is focused on documenting the functionality of timeline templates as well as is generally focused on documentation of behavior for the timeline templates including:

1. How does the import/export behavior currently work for timeline templates
2. How should query overrides work when tied with a rule
3. What areas need to be tested

In addition there are the below issues that have come up around timeline templates:

• https://github.com/elastic/kibana/issues/123493
• https://github.com/elastic/kibana/issues/123300
• https://github.com/elastic/kibana/issues/123370
• https://github.com/elastic/kibana/issues/112293

Details:

• This work should involve documenting the timeline template functionality, fixing the above bugs, and adding any tests.

Background:

• https://github.com/elastic/kibana/issues/50405
• https://github.com/elastic/kibana/issues/69972
• https://github.com/elastic/kibana/pull/67496

Acceptance Criteria

• [ ] Explicit documentation of the behavior around timeline templates

[elasticmachine]

Pinging @elastic/security-threat-hunting (Team:Threat Hunting)

[PhilippeOberti]

@michaelolo24 is that ticket still valid?