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@@ -0,0 +1,87 @@
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+[[release-notes-8.15.1]]
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+== {es} version 8.15.1
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+
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+Also see <<breaking-changes-8.15,Breaking changes in 8.15>>.
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+
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+[[known-issues-8.15.1]]
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+[float]
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+=== Known issues
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+* Elasticsearch will not start if custom role mappings are configured using the
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+`xpack.security.authc.realms.*.files.role_mapping` configuration option. As a workaround, custom role mappings
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+can be configured using the https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-put-role-mapping.html[REST API] (issue: {es-issue}112503[#112503])
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+
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+* ES|QL queries can lead to node crashes due to Out Of Memory errors when:
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+** Multiple indices match the query pattern
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+** These indices have many conflicting field mappings
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+** Many of those fields are included in the request
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+These issues deplete heap memory, increasing the likelihood of OOM errors. (issue: {es-issue}111964[#111964], {es-issue}111358[#111358]).
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++
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+To work around this issue, you have a number of options:
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+** Downgrade to an earlier version
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+** Upgrade to 8.15.2 upon release
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+** Follow the instructions to
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+<<esql-kibana-enable,disable ES|QL queries in {kib}>>
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+** Change the default data view in Discover to a smaller set of indices and/or one with fewer mapping conflicts.
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+
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+[[bug-8.15.1]]
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+[float]
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+=== Bug fixes
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+
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+Aggregations::
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+* Revert "Avoid bucket copies in Aggs" {es-pull}111758[#111758] (issue: {es-issue}111679[#111679])
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+
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+Authorization::
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+* Fix DLS over Runtime Fields {es-pull}112260[#112260] (issue: {es-issue}111637[#111637])
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+
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+ES|QL::
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+* Avoid losing error message in failure collector {es-pull}111983[#111983] (issue: {es-issue}111894[#111894])
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+* Avoid wrapping rejection exception in exchange {es-pull}112178[#112178] (issue: {es-issue}112106[#112106])
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+* ESQL: Fix for overzealous validation in case of invalid mapped fields {es-pull}111475[#111475] (issue: {es-issue}111452[#111452])
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+
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+Geo::
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+* Add maximum nested depth check to WKT parser {es-pull}111843[#111843]
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+* Always check `crsType` when folding spatial functions {es-pull}112090[#112090] (issue: {es-issue}112089[#112089])
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+* Fix NPE when executing doc value queries over shape geometries with empty segments {es-pull}112139[#112139]
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+
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+Indices APIs::
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+* Fix template alias parsing livelock {es-pull}112217[#112217]
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+
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+Infra/Core::
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+* Fix windows memory locking {es-pull}111866[#111866] (issue: {es-issue}111847[#111847])
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+
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+Ingest Node::
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+* Fixing incorrect bulk request took time {es-pull}111863[#111863] (issue: {es-issue}111854[#111854])
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+* Improve performance of grok pattern cycle detection {es-pull}111947[#111947]
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+
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+Logs::
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+* Merge multiple ignored source entires for the same field {es-pull}111994[#111994] (issue: {es-issue}111694[#111694])
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+
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+Machine Learning::
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+* [Inference API] Move Delete inference checks to threadpool worker {es-pull}111646[#111646]
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+
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+Mapping::
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+* Check for valid `parentDoc` before retrieving its previous {es-pull}112005[#112005] (issue: {es-issue}111990[#111990])
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+* Fix calculation of parent offset for ignored source in some cases {es-pull}112046[#112046]
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+* Fix synthetic source for empty nested objects {es-pull}111943[#111943] (issue: {es-issue}111811[#111811])
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+* No error when `store_array_source` is used without synthetic source {es-pull}111966[#111966]
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+* Prevent synthetic field loaders accessing stored fields from using stale data {es-pull}112173[#112173] (issue: {es-issue}112156[#112156])
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+
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+Ranking::
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+* Properly handle filters on `TextSimilarityRank` retriever {es-pull}111673[#111673]
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+
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+Relevance::
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+* Semantic reranking should fail whenever inference ID does not exist {es-pull}112038[#112038] (issue: {es-issue}111934[#111934])
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+* [Bugfix] Add `accessDeclaredMembers` permission to allow search application templates to parse floats {es-pull}111285[#111285]
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+
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+Search::
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+* Explain Function Score Query {es-pull}111807[#111807]
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+
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+Security::
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+* Fix "unexpected field [remote_cluster]" for CCS (RCS 1.0) when using API key that references `remote_cluster` {es-pull}112226[#112226]
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+* Fix connection timeout for `OpenIdConnectAuthenticator` get Userinfo {es-pull}112230[#112230]
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+
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+Vector Search::
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+* Fix `NullPointerException` when doing knn search on empty index without dims {es-pull}111756[#111756] (issue: {es-issue}111733[#111733])
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+* Speed up dense/sparse vector stats {es-pull}111729[#111729] (issue: {es-issue}111715[#111715])
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+
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+
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Nik Everett