fix: reindex_studio was crashing if instance had too many courses

[bradenmacdonald]

Description

This fixes https://github.com/openedx/modular-learning/issues/223 "Cannot create initial search index on instances with many courses".

The problem was that calling store.get_courses() would load too much data into memory at once.

To fix this, I changed the code to use CourseOverview to get the total course count, and to do a paginated query that loads only 1,000 course IDs (and names) at a time.

Supporting information

https://github.com/openedx/modular-learning/issues/223

Testing instructions

See instructions for enabling Studio Content Search at https://openedx.atlassian.net/wiki/spaces/COMM/pages/3890380898/Next+Release+Redwood+-+Operator+Dev+Notes and follow that procedure.

Deadline

None, but we'd like to backport this fix to Redwood.

Private ref: MNG-4278

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[bradenmacdonald]

@MoisesGSalas Does this fix the issue you were seeing?

[MoisesGSalas]

I will try to test it out between today and tomorrow.

[MoisesGSalas]

I tried running it again and it does index successfully. The only issue I'm seeing is that this is going to take a while, it has indexed 2500 courses in around 3 hours, so it will probably take two days to finish.

I'm assuming that kind of optimization is outside the scope of this PR?

[bradenmacdonald]

Yeah, for this PR I just want to get it working. Optimizations can be looked at separately. Thanks for testing it!

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[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.