Close content gap for ignore_above mapping parameter

[vagimeli]

Description

Closes content gap

Issues Resolved

#7115

Version

Frontend features

If you're submitting documentation for an OpenSearch Dashboards feature, add a video that shows how a user will interact with the UI step by step. A voiceover is optional.

Checklist

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[github-actions]

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[vagimeli]

@dhwanilpatel @bharath-techie @mgodwan We're trying to closing content gaps for the format mapping parameter. Will one of you provide technical review of the content and example? For any missing information, please provide your input with any applicable examples. Thank you.