SOLR-11033: introduce multilingual configset

[epugh]

https://issues.apache.org/jira/browse/SOLR-11033

Description

See JIRA

Solution

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Tests

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Checklist

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• [ ] I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• [ ] I have created a Jira issue and added the issue ID to my pull request title.
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• [ ] I have developed this patch against the main branch.
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• [ ] I have added tests for my changes.
• [ ] I have added documentation for the Reference Guide

[epugh]

The code for loading the _multilingual configset is rough, and probably can be refactored. However it all appears to work!

[thelabdude]

Hi Eric, will go through this soon!

[epugh]

TestSchemaDesignerConfigSetHelper.testEnableDisableOptions is busted... TestSchemaAPI all works.....

[epugh]

Also, feel free to push any changes to this branch ;-)

[thelabdude]

what's the timing for this? I see the jira was opened years ago, why is this needed now anyway?

I'll need some time (that I don't have right now) to think through all of this ...

[epugh]

It actually isn't time sensitive... Though I hope it doesn't linger on the vine for weeks ;-). It would be nice to have it in before a 9.1 release. If this goes through, imagine if we added more sample collections like a _geospatial or _embeddings or even _onnx that users can adopt via the Schema Designer ;-).

[epugh]

Tests are now passing, though I don't love what I did in #7354bb629318a59ab51d80332f4cdf355d590cd7 to make it pass!

[epugh]

@thelabdude I just heard the very first rumbling of a 9.1 release.... Have you had a chance to think more about this approach? Does this need a discussion on the mailing list?

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