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What type of PR is this?

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/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

What this PR does / why we need it:

improve FieldIndexer setting in yurt-manager

Which issue(s) this PR fixes:

Fixes #1794

Special notes for your reviewer:

Does this PR introduce a user-facing change?

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@@            Coverage Diff             @@
##           master    #1834      +/-   ##
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+ Coverage   52.11%   52.18%   +0.07%     
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  Files         172      172              
  Lines       20836    20824      -12     
==========================================
+ Hits        10858    10868      +10     
+ Misses       9016     8995      -21     
+ Partials      962      961       -1     

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