Add 8.1.0 release notes (elastic#83741)

docs/changelog/83213.yaml

@@ -1,5 +1,5 @@
 pr: 83213
-summary: "Fix: reduce float and half-float values to their stored precision"
+summary: "reduce float and half-float values to their stored precision"
 area: Aggregations
 type: bug
 issues: []

docs/changelog/83566.yaml

@@ -1,5 +1,5 @@
 pr: 83566
 summary: Upgrade jANSI dependency to 2.4.0
 area: Security
-type: bug
+type: upgrade
 issues: []

docs/changelog/83637.yaml

@@ -1,5 +1,5 @@
 pr: 83637
-summary: "Fix: ip prefix bucket reduction"
+summary: "ip prefix bucket reduction"
 area: Aggregations
 type: bug
 issues: []

docs/changelog/83715.yaml

@@ -1,5 +1,5 @@
 pr: 83715
-summary: "Fix: backward compatibility with version 7.17.0"
+summary: "backward compatibility with version 7.17.0"
 area: Aggregations
 type: bug
 issues: []

docs/changelog/83785.yaml

@@ -1,5 +1,5 @@
 pr: 83785
-summary: '[GCE Discovery] Correcly handle large zones with 500 or more instances'
+summary: '[GCE Discovery] Correctly handle large zones with 500 or more instances'
 area: Distributed
 type: bug
 issues:

docs/reference/migration/migrate_8_1.asciidoc

@@ -21,10 +21,9 @@ and prevent them from operating normally.
 Before upgrading to 8.1, review these changes and take the described steps
 to mitigate the impact.
 
-//NOTE: The notable-breaking-changes tagged regions are re-used in the
-//Installation and Upgrade Guide
-
-//tag::notable-breaking-changes[]
+// NOTE: The notable-breaking-changes tagged regions are re-used in the
+// Installation and Upgrade Guide
+// tag::notable-breaking-changes[]
 [discrete]
 [[breaking_81_rest_api_changes]]
 ==== REST API changes

docs/reference/release-notes/8.1.asciidoc

@@ -17,7 +17,9 @@ Geo::
 === Bug fixes
 
 Aggregations::
-* Fix: reduce float and half-float values to their stored precision {es-pull}83213[#83213]
+* backward compatibility with version 7.17.0 {es-pull}83715[#83715]
+* ip prefix bucket reduction {es-pull}83637[#83637]
+* reduce float and half-float values to their stored precision {es-pull}83213[#83213]
 * Reenable `BooleanTermsIT` {es-pull}83421[#83421] (issue: {es-issue}83351[#83351])
 
 Allocation::
@@ -33,11 +35,21 @@ Authorization::
 Autoscaling::
 * Fix autoscaling of follower data streams {es-pull}83302[#83302] (issue: {es-issue}82857[#82857])
 
+Distributed::
+* [GCE Discovery] Correctly handle large zones with 500 or more instances {es-pull}83785[#83785] (issue: {es-issue}83783[#83783])
+
 Geo::
 * Handle bounds properly when grid tiles crosses the dateline {es-pull}83348[#83348] (issue: {es-issue}83299[#83299])
 
+Indices APIs::
+* Simplify and speed up `ExecutorSelector` {es-pull}83514[#83514] (issue: {es-issue}82450[#82450])
+
 Infra/Core::
 * Copy `trace.id` in threadcontext stash {es-pull}83218[#83218]
+* Update system index mappings if `_meta` is null {es-pull}83896[#83896] (issue: {es-issue}83890[#83890])
+
+Infra/REST API::
+* Do not allow safelisted media types on Content-Type {es-pull}83448[#83448]
 
 Infra/Scripting::
 * Fix duplicated allow lists upon script engine creation {es-pull}82820[#82820] (issue: {es-issue}82778[#82778])
@@ -48,17 +60,29 @@ Machine Learning::
 * Fail queued inference requests with cause if the process crashes {es-pull}81584[#81584]
 * Fix NLP tokenization `never_split` handling around punctuation {es-pull}82982[#82982]
 * Fix `ZeroShotClassificationConfig` update mixing fields {es-pull}82848[#82848]
+* Fix submit after shutdown in process worker service {es-pull}83645[#83645] (issue: {es-issue}83633[#83633])
 * Fixes `categorize_text` parameter validation to be parse order independent {es-pull}82628[#82628] (issue: {es-issue}82629[#82629])
+* Retry anomaly detection job recovery during relocation {es-pull}83456[#83456]
 * Return `zxx` for `lang_ident_model_1` if no valid text is found for language identification {es-pull}82746[#82746] (issue: {es-issue}81933[#81933])
 * Validate vocabulary on model deployment {es-pull}81548[#81548] (issue: {es-issue}81470[#81470])
+* Wait for model process to stop in stop deployment {es-pull}83644[#83644]
+* Fix a bug in the tuning of the hyperparameters when training regression classification models {ml-pull}2128[#2128]
+* Improve training stability for regression and classification models {ml-pull}2144[#2144], {ml-pull}2147[#2147], {ml-pull}2150[#2150]
+* Avoid edge cases in the classification weights calculation to maximize minimum recall which could lead to only a single class being predicted {ml-pull}2194[#2194]
+* Address cause of "[CStatisticalTests.cc@102] Test statistic is nan" log errors {ml-pull}2196[#2196]
+* Address possible causes of "x = NaN, distribution = N5boost4math23students_t_distribution" log errors {ml-pull}2197[#2197]
 
 Mapping::
 * Add support for sub-fields to `search_as_you_type` fields {es-pull}82430[#82430] (issue: {es-issue}56326[#56326])
 * Better exception message for `MappingParser.parse` {es-pull}80696[#80696]
+* Completion field to support multiple completion multi-fields {es-pull}83595[#83595] (issue: {es-issue}83534[#83534])
 
 Network::
 * Throw `NoSeedNodeLeftException` on proxy failure {es-pull}80961[#80961] (issue: {es-issue}80898[#80898])
 
+Packaging::
+* Add `log4j-slf4j-impl` to `repository-azure` {es-pull}83661[#83661] (issue: {es-issue}83652[#83652])
+
 Recovery::
 * Add missing `indices.recovery.internal_action_retry_timeout` to list of settings {es-pull}83354[#83354]
 * Add missing max overcommit factor to list of (dynamic) settings {es-pull}83350[#83350]
@@ -67,6 +91,7 @@ SQL::
 * Fix txt format for empty result sets {es-pull}83376[#83376]
 
 Search::
+* Avoid eagerly loading `StoredFieldsReader` in fetch phase {es-pull}83693[#83693] (issue: {es-issue}82777[#82777])
 * Returns valid PIT when no index matched {es-pull}83424[#83424]
 
 Security::
@@ -85,6 +110,9 @@ Transform::
 * Fix condition on which the transform stops processing buckets {es-pull}82852[#82852]
 * Prevent stopping of transforms due to threadpool limitation {es-pull}81912[#81912] (issue: {es-issue}81796[#81796])
 
+Watcher::
+* Tolerate empty types array in Watch definitions {es-pull}83524[#83524] (issue: {es-issue}83235[#83235])
+
 [[deprecation-8.1.0]]
 [float]
 === Deprecations
@@ -187,6 +215,8 @@ Machine Learning::
 * Set default value of 30 days for model prune window {es-pull}81377[#81377]
 * Track token positions and use source string to tag NER entities {es-pull}81275[#81275]
 * Warn when creating job with an unusual bucket span {es-pull}82145[#82145] (issue: {es-issue}81645[#81645])
+* Improve skip_model_update rule behavior {ml-pull}2096[#2096]
+* Prevent over-subscription of threads in pytorch_inference {ml-pull}2141[#2141]
 
 Mapping::
 * Allow doc-values only search on geo_point fields {es-pull}83395[#83395]
@@ -195,6 +225,7 @@ Mapping::
 
 Monitoring::
 * Add Enterprise Search monitoring index templates {es-pull}82743[#82743]
+* Add `beats_stats.metrics.apm-server.sampling.tail` to Stack Monitoring templates {es-pull}82401[#82401]
 
 Network::
 * Report close connection exceptions at INFO {es-pull}81768[#81768] (issues: {es-issue}51612[#51612], {es-issue}66473[#66473])
@@ -205,6 +236,7 @@ Recovery::
 * Adjust `indices.recovery.max_bytes_per_sec` according to external settings {es-pull}82819[#82819]
 
 SQL::
+* Compress Cursors {es-pull}83591[#83591]
 * Extend Tableau connector to reconnect with catalog {es-pull}81321[#81321]
 
 Search::
@@ -219,14 +251,6 @@ Search::
 * Short cut if reader has point values {es-pull}80268[#80268]
 * Support combining `_shards` preference param with `<custom-string>` {es-pull}80024[#80024] (issue: {es-issue}80021[#80021])
 
-Security::
-* Activate user profile API {es-pull}82400[#82400]
-* Add an initial `ProfileService` for user profiles {es-pull}81899[#81899]
-* Add new system index for user profile documents {es-pull}81355[#81355]
-* Add update user profile data API {es-pull}82772[#82772]
-* Add user profile API for get profile by UID {es-pull}81910[#81910]
-* Update Kibana system user privileges {es-pull}82781[#82781]
-
 Snapshot/Restore::
 * Add Linux x86-64bits native method to retrieve the number of allocated bytes on disk for a file {es-pull}80437[#80437] (issue: {es-issue}79698[#79698])
 
@@ -248,10 +272,6 @@ Transform::
 [float]
 === New features
 
-Authentication::
-* Initial version of JWT Realm {es-pull}82175[#82175]
-* Introduce domain setting to associate realms {es-pull}81968[#81968]
-
 Distributed::
 * Add desired nodes API {es-pull}82975[#82975]
 
@@ -274,11 +294,19 @@ Transform::
 Geo::
 * Update vector tiles google protobuf to 3.16.1 {es-pull}83402[#83402]
 
+Machine Learning::
+* Upgrade Boost libraries to version 1.77 {ml-pull}2095[#2095]
+* Upgrade RapidJSON to 31st October 2021 version {ml-pull}2106[#2106]
+* Upgrade Eigen library to version 3.4.0. (See {ml-pull}2137[#2137]
+
 Network::
 * Upgrade to Netty 4.1.73 {es-pull}82844[#82844]
 
 Packaging::
 * Bump bundled JDK to 17.0.2+8 {es-pull}83243[#83243] (issue: {es-issue}83242[#83242])
 
+Security::
+* Upgrade jANSI dependency to 2.4.0 {es-pull}83566[#83566]
+