[9.0] Fix rare failures in YAML xContent roundtrip tests (#121515) #121682
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Under very unfortunate conditions tests that check xContent objects roundtrip parsing (like i.e. SearchHitsTests#testFromXContent) can fail when we happen to randomly pick YAML xContent type and create random (realistic)Unicode character sequences that may contain the character U+0085 (133) from the Latin1 code page. That specific character doesn't get parsed back to its original form for YAML xContent, which can lead to rare but hard to diagnose test failures. This change adds logic to AbstractXContentTestCase#test() which lies at the core of most of our xContent roundtrip tests that disallows test instances containing that particular character when using YAML xContent type. Closes elastic#97716
cbuescher
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:Search Foundations/Search
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Backports the following commits to 9.0: