[Test] add test to verify that BufferedTokenizerExt doesn't apply enc…

[andsel]

…oding twice

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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

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[elastic-sonarqube]

Quality Gate passed

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• :java: Java unit tests
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• 🥼 Integration Tests / part 1

History

• 💔 Build #1864 failed c9581ce

cc @andsel