SDSTOR-21408 : refine index_kv constructor

[JacksonYao287]

root cause is not figured out. but let`s make this change to refine index_kv constructor and see if this issue will occur again

[codecov-commenter]

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Additional details and impacted files

@@              Coverage Diff               @@
##             stable/v4.x     #414   +/-   ##
==============================================
  Coverage               ?   52.79%           
==============================================
  Files                  ?       36           
  Lines                  ?     5328           
  Branches               ?      662           
==============================================
  Hits                   ?     2813           
  Misses                 ?     2221           
  Partials               ?      294           

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[xiaoxichen]

what is the RCA of the issue?