Add flush rest api specs #22628

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ruowan merged 9 commits intoAzure:mainfrom

revanthballa1188:redisenterprise-Microsoft.Cache-2023-03-01-preview-v2

Feb 22, 2023

Commits on Feb 16, 2023

updating the texts
revanthballa1188
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Commits on Feb 17, 2023

Make the ids of the flush parameters to be optional
revanthballa1188
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