Reimplemented LogStash::String setting in Java

[andsel]

Release notes

What does this PR do?

Why is it important/What is the impact to the user?

Checklist

• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files (and/or docker env variables)
• [ ] I have added tests that prove my fix is effective or that my feature works

Author's Checklist

• [ ] Implements the other constructors, with 2 and 3 params and spread the use
  • [ ] Execute SPEC_OPTS="-fd -f logstash-core/spec/logstash/runner_spec.rb" ./gradlew --rerun-tasks :logstash-core:rubyTests there is a problem in reading the deprecation logger messages in https://github.com/elastic/logstash/blob/467ab3f44b6f0c2b09f6c39b7a5f90727e761485/logstash-core/spec/logstash/runner_spec.rb#L269. Suggestion mock the Appender and reconfigure logs?
• [ ] Check the code for other instantiations of LogStash::String.new
• [ ] Translate RSpec tests to JUnit if there are or cover with some testing
• [ ] Rename StringSetting to String and use explicit java.lang.String around

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[elastic-sonarqube[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[elastic-sonarqube[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: c212855e1933ab1a5e57a95a55193e0bbc83c894

History

• :green_heart: Build #2124 succeeded 6380a323a129107eb63f44c41fcc0c9502cb25fb
• :green_heart: Build #2086 succeeded 605459c53a5e73a4282b76df14e2d3b7bda0d0d9
• :broken_heart: Build #2085 failed 187af42317d13642f27cc4d4fc36482a6586227b
• :green_heart: Build #1846 succeeded dcae6f5c9d64d4aaaa531bdcf3aaf37b5e381f91
• :broken_heart: Build #1842 failed 180d5975ef1640a8911638f5e1f85c67addc61ee
• :yellow_heart: Build #1841 was flaky 91e2048b7b6ddf8bed48439b973be9630735d96a

cc @andsel

[andsel]

@logstashmachine backport 8.17

[andsel]

@logstashmachine backport 8.16

[andsel]

8.17: ~~https://github.com/elastic/logstash/pull/16947~~ https://github.com/elastic/logstash/pull/16960 8.16: ~~https://github.com/elastic/logstash/pull/16948~~ https://github.com/elastic/logstash/pull/16961

[kaisecheng]

@andsel please also backport to 8.x

[andsel]

@logstashmachine backport 8.x

[andsel]

8.x backport https://github.com/elastic/logstash/pull/16959