[Django] #34708: Sometimes `db_index=True` doesn't apply

[Django]

#34708: Sometimes `db_index=True` doesn't apply
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Reporter: o-ddong | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 3.2
layer (models, ORM) | Keywords: ORM, db_index,
Severity: Normal | mysql
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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As the title says, sometimes db_index=True doesn't apply

When performing makemigration, changes in db_index were checked, and when
the contents were migrated, the contents were not applied to mysql.

Can you tell me what could be the reason for this and how to fix it?

Django : 3.2.19
Python : 3.8.1
DB : MySQL 8.0

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Ticket URL: <https://code.djangoproject.com/ticket/34708>
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