[v5] defaultIndex is removed and not included in breaking changes

[MattieBelt]

Link to the documentation page or resource

https://docs-next.strapi.io/dev-docs/configurations/middlewares#public

Describe the bug

The defaultIndex and the /index.html have been removed in v5, but not included in the breaking changes and removed from the middleware docs.

Additional context

https://github.com/strapi/strapi/commit/38a7e3ce244c3655419c1beaecac9fb08a3eff8a

Suggested improvements or fixes

No response

Related issue(s)/PR(s)

https://github.com/strapi/strapi/issues/20013

[pwizla]

Thanks for reporting, @MattieBelt! I'll add it.

[pwizla]

Added, see https://docs-next.strapi.io/dev-docs/migration/v4-to-v5/breaking-changes/default-index-removed