Fix CJKBigramFilter inconsistent positions with outputUnigrams disabled#15825

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herley-shaori:fix/15812-cjk-bigram-position-inconsistency

Commits on Mar 14, 2026

Fix CJKBigramFilter producing inconsistent positions with outputUnigrams disabled (#15812)
herley
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Commits on Mar 16, 2026

Update TestCJKAnalyzer expected positions to match corrected CJKBigramFilter behavior
herley
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Simplify flushUnigram guard: remove redundant !outputUnigrams check
herley
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Remove redundant guards on hadBigrams and deferredPosInc checks
herley
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