fix build issue of common util

[ylwu-amzn]

Issue #, if available:

Description of changes:

FIx build failure of common util lib.

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[codecov]

Codecov Report

Merging #281 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #281      +/-   ##
============================================
+ Coverage     70.67%   70.69%   +0.02%     
  Complexity     1777     1777              
============================================
  Files           186      186              
  Lines          8597     8597              
  Branches        731      731              
============================================
+ Hits           6076     6078       +2     
+ Misses         2175     2174       -1     
+ Partials        346      345       -1     

Flag	Coverage Δ	Complexity Δ
#plugin	69.91% <ø> (+0.02%)	1777.00 <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ	Complexity Δ
...sticsearch/ad/indices/AnomalyDetectionIndices.java	73.93% <0.00%> (-1.22%)	31.00% <0.00%> (-1.00%)
...ransport/DeleteAnomalyDetectorTransportAction.java	57.95% <0.00%> (+4.54%)	16.00% <0.00%> (+1.00%)