Use the keyword field for tags in related query

[obulat]

Fixes

Follow up for #3307

Description

The related query uses the terms query to match the tags. It was, however, using a text field (tags.name) instead of a keyword field(tags.name.keyword), which is bad for performance¹. This PR fixes it by adding the .keyword suffix to the query. The tests are updated accordingly.

Setting the priority to high because this needs to be deployed together with the other changes to the related query in #3307.

Testing Instructions

CI passing is a good indication that the change is correct because we have the tests for the related endpoint.

Checklist

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Footnotes

1. Why you should avoid using text fields for term query ↩

[AetherUnbound]

LGTM!