Add temporary index to support dismissal_reason backfill
What does this MR do and why?
Add temporary index to support dismissal_reason
backfill
Related to !123518 (comment 1433364010)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.