change to support java 8 in compile and runtime

[zhongnansu]

Signed-off-by: Zhongnan Su [email protected]

Description

[Describe what this change achieves]

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #575 (751d575) into main (b4f491a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #575   +/-   ##
=========================================
  Coverage     53.24%   53.24%           
  Complexity      271      271           
=========================================
  Files           236      236           
  Lines          7779     7779           
  Branches       1611     1611           
=========================================
  Hits           4142     4142           
  Misses         3439     3439           
  Partials        198      198           

Flag	Coverage Δ
dashboards-observability	46.02% <ø> (ø)
opensearch-observability	72.33% <100.00%> (ø)

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Impacted Files	Coverage Δ
...pensearch/observability/settings/PluginSettings.kt	73.98% <100.00%> (ø)

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