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With this commit we enable the Jackson feature 'STRICT_DUPLICATE_DETECTION' by default. This ensures that JSON keys are always unique. While this has a performance impact, benchmarking has indicated that the typical drop in indexing throughput is around 1 - 2%. As a last resort, we allow users to still disable strict duplicate checks by setting `-Des.json.strict_duplicate_detection=false` which is intentionally undocumented. Closes #19614