fix unmappable character for encoding US-ASCII

[ylwu-amzn]

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[ylwu-amzn]

UT failed https://github.com/opensearch-project/ml-commons/actions/runs/4235564324/jobs/7359342189
@wujunshen , can you help take a look?
BTW, @model-collapse confirmed, we will not release model auto-reload in 2.6, I will rollback the code change in 2.x to make sure the build can pass.

org.opensearch.ml.model.MLModelAutoReloaderITTests > testAutoReloadModelByNodeId_IndexNotFound FAILED
    java.lang.AssertionError: Shard [.plugins-ml-model-reload][0] is still locked after 5 sec waiting

[codecov-commenter]

Codecov Report

Merging #738 (7e05b7c) into 2.x (7ae4192) will decrease coverage by 0.23%.
The diff coverage is n/a.

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@@             Coverage Diff              @@
##                2.x     #738      +/-   ##
============================================
- Coverage     84.55%   84.33%   -0.23%     
+ Complexity     1618     1589      -29     
============================================
  Files           136      135       -1     
  Lines          6068     5935     -133     
  Branches        568      560       -8     
============================================
- Hits           5131     5005     -126     
+ Misses          700      693       -7     
  Partials        237      237              

Flag	Coverage Δ
ml-commons	84.33% <ø> (-0.23%)	⬇️

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

Impacted Files	Coverage Δ
...gine/algorithms/regression/LogisticRegression.java	80.00% <ø> (ø)
...rg/opensearch/ml/plugin/MachineLearningPlugin.java	98.82% <ø> (-0.03%)	⬇️
.../org/opensearch/ml/settings/MLCommonsSettings.java	100.00% <ø> (ø)
.../cluster/MLCommonsClusterManagerEventListener.java	67.64% <0.00%> (-11.77%)	⬇️
...earch/ml/action/load/TransportLoadModelAction.java	84.07% <0.00%> (-1.77%)	⬇️

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[ylwu-amzn]

CVE failure caused by snakeyaml. From the opensearch-project/OpenSearch#5576, the CVE fixed,

I believe all usages of SnakeYaml in OpenSearch are now using SafeConstructor() after #6205, per the recommendation in the CVE.