[sumac] fix: allow non-Elasticsearch search engines when reindexing courses [FC-0062]

[pomegranited]

Description

This PR only fixes the reindex_course management command so it can be used when indexing courses on Meilisearch.

Supporting information

Relates to: overhangio/tutor#1141
Part of: openedx/modular-learning#236
Private-ref: FAL-3903

Testing instructions

See #35743

Deadline

ASAP

[openedx-webhooks]

Thanks for the pull request, @pomegranited!

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[navinkarkera]

Looks good.