Remove unreferenced subfields in indices

[dhruvkb]

Series

This PR is part 3/3

1. Reduce ES shard count and simplify index properties #3143
2. Use top-level keyword fields instead of subfields #3161
3. This PR

Fixes

Fixes #2154 by @sarayourfriend

Description

This PR removes the unreferenced subfields from the ES indices.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

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[obulat]

Exciting!

[krysal]

LGTM