[8.0] Fix NullPointerException in SystemIndexMetadataUpgradeService hidden alias handling (#84780)#84834
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elasticsearchmachine merged 1 commit intoelastic:8.0from Mar 9, 2022
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…alias handling (elastic#84780) * Fix an NPE in hidden alias logic * Update docs/changelog/84780.yaml * Simplify conditional
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Backports the following commits to 8.0: