Add parent to Aggregation topics

[hdhalter]

Description

Trying to fix the breadcrumb problem

Issues Resolved

Closes #6935

Version

List the OpenSearch version to which this PR applies, e.g. 2.14, 2.12--2.14, or all.

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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[hdhalter]

@AMoo-Miki, @Naarcha-AWS , @kolchfa-aws - I added a parent topic to the subtopics, but with this fix, they don't appear in the nav pane (see #6935 (comment)). You can navigate to them, you just can't see them. Any ideas on how to get this to work correctly? If it can't work with our current config, we can close this PR.

[kolchfa-aws]

The index pages for the collections have to be excluded from the parent/grandparent relationship. Let me put a fix through: you can close this PR.

[kolchfa-aws]

Fixed in #7758