[9.0] Avoid unnecessary determinization in index pattern conflict checks#128759
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elasticsearchmachine merged 1 commit intoelastic:9.0from Jun 2, 2025
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[9.0] Avoid unnecessary determinization in index pattern conflict checks#128759elasticsearchmachine merged 1 commit intoelastic:9.0from
elasticsearchmachine merged 1 commit intoelastic:9.0from
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…lastic#128362) Starting with Lucene 10, `CharacterRunAutomaton` is no longer determinized automatically. In Elasticsearch 9, we adapted to this by eagerly determinizing automatons early (via `Regex#simpleMatchToAutomaton`). However, this introduced regression: operations like index template conflict checks, which only require intersection testing, now pay the cost of determinization—an expensive step that wasn’t needed before. In some cases, especially when many wildcard patterns are involved, determinization can even fail due to state explosion. This change removes the unnecessary determinization, restoring the pre-9.0 behavior and allowing valid index templates with many patterns to be registered again.
jimczi
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>bug
:Data Management/Indices APIs
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Backport of #128362 to 9.0