Elasticsearch version 8.9.1edit
Also see Breaking changes in 8.9.
Bug fixesedit
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Aggregations
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GlobalAggregator should call rewrite() before createWeight() #98091 (issue: #98076)
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Cluster Coordination
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Improve exception handling in Coordinator#publish #97840 (issue: #97798)
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EQL
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Backport fix for async missing events and re-enable the feature #98130
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ILM+SLM
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Ignore the
total_shards_per_node setting on searchable snapshots in frozen #97979
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Migrate to data tiers routing configures correct default for mounted indices #97936 (issue: #97898)
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Infra/Core
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Fix APM trace start time #98113
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Infra/Logging
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Add Configuration to
PatternLayout #97679
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Machine Learning
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Fix failure processing Question Answering model output where the input has been spanned over multiple sequences #98167 (issue: #97917)
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Search
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UnmappedFieldFetcher should ignore nested fields #97987 (issue: #97684)
Enhancementsedit
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Authentication
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Upgrade xmlsec to 2.1.8 #97741
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Infra/Core
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Enhance regex performance with duplicate wildcards #98176
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Machine Learning
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Add setting to scale the processor count used in the model assignment planner #98296
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Search
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Refactor nested field handling in
FieldFetcher #97683