Add javadoc utf8 encoding support in AD

[peterzhuamazon]

Description

Add javadoc utf8 encoding support in AD0

Issues Resolved

#244

Check List

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[codecov-commenter]

Codecov Report

Merging #249 (63e2172) into main (57247df) will increase coverage by 0.32%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #249      +/-   ##
============================================
+ Coverage     78.58%   78.91%   +0.32%     
- Complexity     3723     3739      +16     
============================================
  Files           275      275              
  Lines         15569    15569              
  Branches       1624     1624              
============================================
+ Hits          12235    12286      +51     
+ Misses         2626     2576      -50     
+ Partials        708      707       -1     

Flag	Coverage Δ
plugin	78.91% <ø> (+0.32%)	⬆️

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

Impacted Files	Coverage Δ
...ansport/handler/AnomalyResultBulkIndexHandler.java	85.71% <0.00%> (-4.09%)	⬇️
...ain/java/org/opensearch/ad/task/ADTaskManager.java	77.53% <0.00%> (+0.23%)	⬆️
.../java/org/opensearch/ad/caching/PriorityCache.java	69.16% <0.00%> (+0.55%)	⬆️
...rch/ad/transport/AnomalyResultTransportAction.java	80.69% <0.00%> (+0.69%)	⬆️
...java/org/opensearch/ad/task/ADBatchTaskRunner.java	82.78% <0.00%> (+1.26%)	⬆️
.../java/org/opensearch/ad/util/RestHandlerUtils.java	84.74% <0.00%> (+1.69%)	⬆️
...rch/ad/transport/ForwardADTaskTransportAction.java	97.45% <0.00%> (+3.38%)	⬆️
...va/org/opensearch/ad/feature/SearchFeatureDao.java	81.47% <0.00%> (+4.11%)	⬆️
...c/main/java/org/opensearch/ad/util/ParseUtils.java	67.06% <0.00%> (+4.36%)	⬆️
...port/SearchAnomalyDetectorInfoTransportAction.java	68.88% <0.00%> (+4.44%)	⬆️
... and 1 more