[REQUEST]: SIEM Migration documentation

[Charelzard]

Description

We are introducing a new feature in Elastic to help users migrate SIEM solutions from Splunk to Elastic:

https://docs.google.com/document/d/1iaEm_6IJjQzi8NB2txJmAHjegXm40wnejX53yUlzz_0/edit?usp=sharing

Resources

No other documentation currently exists. Please sync with me on the placement of this within our docs as well as linking from other resources like the getting started for security.

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

This is similar except for a linking issue that will be updated in 8.19. Happy to explain further.

What release is this request related to?

8.18

Collaboration model

The documentation team

Point of contact.

Main contact: @Charelzard

Stakeholders:

[benironside]

9.0 draft is in this PR: #713
I'll work on the 8.18 version once we've finalized the 9.0 version.

[benironside]

done