ddl: fix rename index for expression indexes (#51984)#53737

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ti-chi-bot[bot] merged 1 commit intopingcap:release-6.5from ti-chi-bot:cherry-pick-51984-to-release-6.5

Jun 5, 2024

+74

Commits on Jun 3, 2024

This is an automated cherry-pick of pingcap#51984

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