Removed changes introduced to support JDK8

[vmmusings]

Signed-off-by: vamsi-amazon [email protected]

Description

Removed changes introduced to support JDK8.

Issues Resolved

#466

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 #513 (adbcb70) into main (6771968) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #513   +/-   ##
=========================================
  Coverage     95.24%   95.24%           
  Complexity     2744     2744           
=========================================
  Files           276      276           
  Lines          7410     7410           
  Branches        537      537           
=========================================
  Hits           7058     7058           
  Misses          298      298           
  Partials         54       54           

Flag	Coverage Δ
query-workbench	62.91% <ø> (ø)
sql-engine	98.40% <100.00%> (ø)

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

Impacted Files	Coverage Δ
...g/opensearch/sql/expression/text/TextFunction.java	100.00% <100.00%> (ø)

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[penghuo]

LGTM