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OpenSearch/docs/reference/release-notes/7.5.asciidoc
Przemyslaw Gomulka 412e163cf6
[Doc] migration guide joda (#51986) 
The joda to java.time migration requires users to upgrade their mappings. We allow them to still use 6.x created indices with joda patterns in 7 but ask them to upgrade their patterns in 7.x.
This migration guide is to help them understand how they could be affected and what needs to be changed in their mappings.
closes #51614
closes #51236
2020-03-23 08:29:01 +01:00

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[[release-notes-7.5.2]]
== {es} version 7.5.2
coming::[7.5.2]
[[bug-7.5.2]]
[float]
=== Bug fixes
Machine Learning::
* Fixes potential memory corruption or inconsistent state when background
persisting categorizer state. {ml-pull}921[#921]
[[release-notes-7.5.1]]
== {es} version 7.5.1
Also see <<breaking-changes-7.5,Breaking changes in 7.5>>.
[[enhancement-7.5.1]]
[float]
=== Enhancements
Features/Watcher::
* Log attachment generation failures {pull}50080[#50080]
Network::
* Netty4: switch to composite cumulator {pull}49478[#49478]
[[bug-7.5.1]]
[float]
=== Bug fixes
Authentication::
* Fix iterate-from-1 bug in smart realm order {pull}49473[#49473]
CRUD::
* Do not mutate request on scripted upsert {pull}49578[#49578] (issue: {issue}48670[#48670])
Cluster Coordination::
* Make elasticsearch-node tools custom metadata-aware {pull}48390[#48390]
Engine::
* Account trimAboveSeqNo in committed translog generation {pull}50205[#50205] (issue: {issue}49970[#49970])
Features/ILM+SLM::
* Handle failure to retrieve ILM policy step better {pull}49193[#49193] (issue: {pull}49128[#49128])
Features/Java High Level REST Client::
* Support es7 node http publish_address format {pull}49279[#49279] (issue: {issue}48950[#48950])
Geo::
* Fix handling of circles in legacy geo_shape queries {pull}49410[#49410] (issue: {issue}49296[#49296])
Infra/Packaging::
* Extend systemd timeout during startup {pull}49784[#49784] (issue: {issue}49593[#49593])
Machine Learning::
* Use query in cardinality check {pull}49939[#49939]
* Fix expired job results deletion audit message {pull}49560[#49560] (issue: {issue}49549[#49549])
* Apply source query on data frame analytics memory estimation {pull}49527[#49527] (issue: {issue}49454[#49454])
* Stop timing stats failure propagation {pull}49495[#49495]
Mapping::
* Improve DateFieldMapper `ignore_malformed` handling {pull}50090[#50090] (issue: {issue}50081[#50081])
Recovery::
* Migrate peer recovery from translog to retention lease {pull}49448[#49448] (issue: {issue}45136[#45136])
SQL::
* COUNT DISTINCT returns 0 instead of NULL for no matching docs {pull}50037[#50037] (issue: {issue}50013[#50013])
* Fix LOCATE function optional parameter handling {pull}49666[#49666] (issue: {issue}49557[#49557])
* Fix NULL handling for FLOOR and CEIL functions {pull}49644[#49644] (issue: {issue}49556[#49556])
* Handle NULL arithmetic operations with INTERVALs {pull}49633[#49633] (issue: {issue}49297[#49297])
* Fix issue with GROUP BY YEAR() {pull}49559[#49559] (issue: {issue}49386[#49386])
* Fix issue with CASE/IIF pre-calculating results {pull}49553[#49553] (issue: {issue}49388[#49388])
* Fix issue with folding of CASE/IIF {pull}49449[#49449] (issue: {issue}49387[#49387])
* Fix issues with WEEK/ISO_WEEK/DATEDIFF {pull}49405[#49405] (issues: {issue}48209[#48209], {issue}49376[#49376])
Snapshot/Restore::
* Fix Index Deletion during Snapshot Finalization {pull}50202[#50202] (issues: {issue}45689[#45689], {issue}50200[#50200])
Transform::
* Fix possible audit logging disappearance after rolling upgrade {pull}49731[#49731] (issue: {issue}49730[#49730])
[[release-notes-7.5.0]]
== {es} version 7.5.0
Also see <<breaking-changes-7.5,Breaking changes in 7.5>>.
[[known-issues-7.5.0]]
[float]
=== Known issues
* Stop all {transforms} during a rolling upgrade to 7.5.
If a {transform} is running during upgrade, the {transform} audit index might disappear.
(issue: {issue}/49730[#49730])
* Indices created in 6.x with <<date,`date`>> and <<date_nanos,`date_nanos`>> fields using formats
that are incompatible with java.time patterns will cause parsing errors, incorrect date calculations or wrong search results.
https://github.com/elastic/elasticsearch/pull/52555
This is fixed in {es} 7.7 and later versions.
[[breaking-7.5.0]]
[float]
=== Breaking changes
Search::
* Add support for aliases in queries on _index. {pull}46640[#46640] (issues: {issue}23306[#23306], {issue}34089[#34089])
[[deprecation-7.5.0]]
[float]
=== Deprecations
Aggregations::
* Deprecate the "index.max_adjacency_matrix_filters" setting {pull}46394[#46394] (issue: {issue}46324[#46324])
Allocation::
* Deprecate include_relocations setting {pull}47443[#47443] (issue: {issue}46079[#46079])
Mapping::
* Deprecate `_field_names` disabling {pull}42854[#42854] (issue: {issue}27239[#27239])
Search::
* Reject regexp queries on the _index field. {pull}46945[#46945] (issues: {issue}34089[#34089], {issue}46640[#46640])
[[feature-7.5.0]]
[float]
=== New features
Features/ILM+SLM::
* Add API to execute SLM retention on-demand {pull}47405[#47405] (issues: {issue}43663[#43663], {issue}46508[#46508])
* Add retention to Snapshot Lifecycle Management {pull}46407[#46407] (issues: {issue}38461[#38461], {issue}43663[#43663], {issue}45362[#45362])
Features/Ingest::
* Add enrich processor {pull}48039[#48039] (issue: {issue}32789[#32789])
Machine Learning::
* Implement evaluation API for multiclass classification problem {pull}47126[#47126] (issue: {issue}46735[#46735])
* Implement new analysis type: classification {pull}46537[#46537] (issue: {issue}46735[#46735])
* Add audit messages for Data Frame Analytics {pull}46521[#46521] (issue: {issue}184[#184])
* Implement DataFrameAnalyticsAuditMessage and DataFrameAnalyticsAuditor {pull}45967[#45967]
SQL::
* SQL: Implement DATEDIFF function {pull}47920[#47920] (issue: {issue}47919[#47919])
* SQL: Implement DATEADD function {pull}47747[#47747] (issue: {issue}47746[#47746])
* SQL: Implement DATE_PART function {pull}47206[#47206] (issue: {issue}46372[#46372])
* SQL: Add alias DATETRUNC to DATE_TRUNC function {pull}47173[#47173] (issue: {issue}46473[#46473])
* SQL: Add PIVOT support {pull}46489[#46489]
* SQL: Implement DATE_TRUNC function {pull}46473[#46473] (issue: {issue}46319[#46319])
[[enhancement-7.5.0]]
[float]
=== Enhancements
Aggregations::
* Adjacency_matrix aggregation memory usage optimisation. {pull}46257[#46257] (issue: {issue}46212[#46212])
* Support geotile_grid aggregation in composite agg sources {pull}45810[#45810] (issue: {issue}40568[#40568])
Allocation::
* Do not cancel ongoing recovery for noop copy on broken node {pull}48265[#48265] (issue: {issue}47974[#47974])
* Shrink should not touch max_retries {pull}47719[#47719]
* Re-fetch shard info of primary when new node joins {pull}47035[#47035] (issues: {issue}42518[#42518], {issue}46959[#46959])
* Sequence number based replica allocation {pull}46959[#46959] (issue: {issue}46318[#46318])
Authorization::
* Add support to retrieve all API keys if user has privilege {pull}47274[#47274] (issue: {issue}46887[#46887])
* Add 'create_doc' index privilege {pull}45806[#45806]
* Reducing privileges needed by built-in beats_admin role {pull}41586[#41586]
CCR::
* Add Pause/Resume Auto-Follower APIs to High Level REST Client {pull}47989[#47989] (issue: {issue}47510[#47510])
* Add Pause/Resume Auto Follower APIs {pull}47510[#47510] (issue: {issue}46665[#46665])
CRUD::
* Allow optype CREATE for append-only indexing operations {pull}47169[#47169]
Cluster Coordination::
* Warn on slow metadata persistence {pull}47005[#47005]
* Improve LeaderCheck rejection messages {pull}46998[#46998]
Engine::
* Do not warm up searcher in engine constructor {pull}48605[#48605] (issue: {issue}47186[#47186])
* Refresh should not acquire readLock {pull}48414[#48414] (issue: {issue}47186[#47186])
* Avoid unneeded refresh with concurrent realtime gets {pull}47895[#47895]
* sync before trimUnreferencedReaders to improve index preformance {pull}47790[#47790] (issues: {issue}46201[#46201], {issue}46203[#46203])
* Limit number of retaining translog files for peer recovery {pull}47414[#47414]
* Remove isRecovering method from Engine {pull}47039[#47039]
Features/ILM+SLM::
* Separate SLM stop/start/status API from ILM {pull}47710[#47710] (issue: {issue}43663[#43663])
* Set default SLM retention invocation time {pull}47604[#47604] (issue: {issue}43663[#43663])
* ILM: Skip rolling indexes that are already rolled {pull}47324[#47324] (issue: {issue}44175[#44175])
* Add support for POST requests to SLM Execute API {pull}47061[#47061]
* Wait for snapshot completion in SLM snapshot invocation {pull}47051[#47051] (issues: {issue}38461[#38461], {issue}43663[#43663])
* Add node setting for disabling SLM {pull}46794[#46794] (issue: {issue}38461[#38461])
* ILM: parse origination date from index name {pull}46755[#46755] (issues: {issue}42449[#42449], {issue}46561[#46561])
* [ILM] Add date setting to calculate index age {pull}46561[#46561] (issue: {issue}42449[#42449])
Features/Ingest::
* Add the ability to require an ingest pipeline {pull}46847[#46847]
Features/Java High Level REST Client::
* add function submitDeleteByQueryTask in class RestHighLevelClient {pull}46833[#46833]
* return Cancellable in RestHighLevelClient {pull}45688[#45688] (issue: {issue}44802[#44802])
Features/Java Low Level REST Client::
* Add cloudId builder to the HLRC {pull}47868[#47868]
* Add support for cancelling async requests in low-level REST client {pull}45379[#45379] (issues: {issue}43332[#43332], {issue}44802[#44802])
Features/Monitoring::
* Remove hard coded version_created in default monitoring alerts {pull}47744[#47744]
Infra/Circuit Breakers::
* Emit log message when parent circuit breaker trips {pull}47000[#47000]
* Fix G1 GC default IHOP {pull}46169[#46169]
Infra/Core::
* Introduce system JVM options {pull}48252[#48252] (issue: {issue}48222[#48222])
* Set start of the week to Monday for root locale {pull}43652[#43652] (issues: {issue}41670[#41670], {issue}42588[#42588], {issue}43275[#43275])
Infra/Packaging::
* Package the JDK into jdk.app on macOS {pull}48765[#48765]
* Move ES_TMPDIR substitution into jvm options parser {pull}47189[#47189] (issue: {issue}47133[#47133])
* Clarify missing java error message {pull}46160[#46160] (issue: {issue}44139[#44139])
Infra/Scripting::
* Add explanations to script score queries {pull}46693[#46693]
Infra/Settings::
* Do not reference values for filtered settings {pull}48066[#48066]
* Allow setting validation against arbitrary types {pull}47264[#47264] (issue: {issue}25560[#25560])
* Clarify error message on keystore write permissions {pull}46321[#46321]
* Add more meaningful keystore version mismatch errors {pull}46291[#46291] (issue: {issue}44624[#44624])
Machine Learning::
* Throw an exception when memory usage estimation endpoint encounters empty data frame. {pull}49143[#49143] (issue: {issue}49140[#49140])
* Change format of MulticlassConfusionMatrix result to be more self-explanatory {pull}48174[#48174] (issue: {issue}46735[#46735])
* Make num_top_classes parameter's default value equal to 2 {pull}48119[#48119] (issue: {issue}46735[#46735])
* [ML] Add option to stop datafeed that finds no data {pull}47922[#47922]
* Allow integer types for classification's dependent variable {pull}47902[#47902] (issue: {issue}46735[#46735])
* [ML] Add lazy assignment job config option {pull}47726[#47726]
* [ML] Additional outlier detection parameters {pull}47600[#47600]
* [ML] More accurate job memory overhead {pull}47516[#47516]
* [ML] Throttle the delete-by-query of expired results {pull}47177[#47177] (issues: {issue}47003[#47003], {issue}47103[#47103])
Mapping::
* Add migration tool checks for _field_names disabling {pull}46972[#46972] (issues: {issue}42854[#42854], {issue}46681[#46681])
Network::
* Introduce simple remote connection strategy {pull}47480[#47480]
* Enhanced logging when transport is misconfigured to talk to HTTP port {pull}45964[#45964] (issue: {issue}32688[#32688])
Recovery::
* Do not send recovery requests with CancellableThreads {pull}46287[#46287] (issue: {issue}46178[#46178])
SQL::
* SQL: make date/datetime and interval types compatible in conditional functions {pull}47595[#47595] (issue: {issue}46674[#46674])
* SQL: use calendar interval of 1y instead of fixed interval for grouping by YEAR and HISTOGRAMs {pull}47558[#47558] (issue: {issue}40162[#40162])
* SQL: Support queries with HAVING over SELECT {pull}46709[#46709] (issue: {issue}37051[#37051])
* SQL: Add support for shape type {pull}46464[#46464] (issues: {issue}43644[#43644], {issue}46412[#46412])
Search::
* Remove response search phase from ExpandSearchPhase {pull}48401[#48401]
* Add builder for distance_feature to QueryBuilders {pull}47846[#47846] (issue: {issue}47767[#47767])
* Fold InitialSearchPhase into AbstractSearchAsyncAction {pull}47182[#47182]
* max_children exist only in top level nested sort {pull}46731[#46731]
* First round of optimizations for vector functions. {pull}46294[#46294] (issues: {issue}45390[#45390], {issue}45936[#45936], {issue}46103[#46103], {issue}46155[#46155], {issue}46190[#46190], {issue}46202[#46202])
* Throw exception in scroll requests using `from` {pull}46087[#46087] (issues: {issue}26235[#26235], {issue}44493[#44493], {issue}9373[#9373])
Snapshot/Restore::
* Track Repository Gen. in BlobStoreRepository {pull}48944[#48944] (issues: {issue}38941[#38941], {issue}47520[#47520], {issue}47834[#47834], {issue}49048[#49048])
* Resume partial download from S3 on connection drop {pull}46589[#46589]
* More Efficient Ordering of Shard Upload Execution {pull}42791[#42791]
Transform::
* [ML][Transforms] allow executor to call start on started task {pull}46347[#46347]
* [ML-DataFrame] improve error message for timeout case in stop {pull}46131[#46131] (issue: {issue}45610[#45610])
* [ML][Data Frame] add support for `wait_for_checkpoint` flag on `_stop` API {pull}45469[#45469] (issue: {issue}45293[#45293])
[[bug-7.5.0]]
[float]
=== Bug fixes
Aggregations::
* Fix ignoring missing values in min/max aggregations {pull}48970[#48970] (issue: {issue}48905[#48905])
* DocValueFormat implementation for date range fields {pull}47472[#47472] (issues: {issue}47323[#47323], {issue}47469[#47469])
Allocation::
* Auto-expand replicated closed indices {pull}48973[#48973]
* Handle negative free disk space in deciders {pull}48392[#48392] (issue: {issue}48380[#48380])
* Dangling indices strip aliases {pull}47581[#47581]
* Cancel recoveries even if all shards assigned {pull}46520[#46520]
* Fail allocation of new primaries in empty cluster {pull}43284[#43284] (issue: {issue}41073[#41073])
Analysis::
* Reset Token position on reuse in `predicate_token_filter` {pull}47424[#47424] (issue: {issue}47197[#47197])
Audit::
* Audit log filter and marker {pull}45456[#45456] (issue: {issue}47251[#47251])
Authentication::
* Add owner flag parameter to the rest spec {pull}48500[#48500] (issue: {issue}48499[#48499])
* Add populate_user_metadata in OIDC realm {pull}48357[#48357] (issue: {issue}48217[#48217])
* Remove unnecessary details logged for OIDC {pull}48271[#48271]
* Fix AD realm additional metadata {pull}47179[#47179] (issue: {issue}45848[#45848])
* Fallback to realm authc if ApiKey fails {pull}46538[#46538]
* PKI realm accept only verified certificates {pull}45590[#45590]
Authorization::
* Fix security origin for TokenService#findActiveTokensFor... {pull}47418[#47418] (issue: {issue}47151[#47151])
* Use 'should' clause instead of 'filter' when querying native privileges {pull}47019[#47019]
* Do not rewrite aliases on remove-index from aliases requests {pull}46989[#46989]
* Validate index and cluster privilege names when creating a role {pull}46361[#46361] (issue: {issue}29703[#29703])
* Validate `query` field when creating roles {pull}46275[#46275] (issue: {issue}34252[#34252])
CCR::
* CCR should auto-retry rejected execution exceptions {pull}49213[#49213]
* Do not auto-follow closed indices {pull}47721[#47721] (issue: {issue}47582[#47582])
* Relax maxSeqNoOfUpdates assertion in FollowingEngine {pull}47188[#47188] (issue: {issue}47137[#47137])
* Handle lower retaining seqno retention lease error {pull}46420[#46420] (issues: {issue}46013[#46013], {issue}46416[#46416])
CRUD::
* Close query cache on index service creation failure {pull}48230[#48230] (issue: {issue}48186[#48186])
* Use optype CREATE for single auto-id index requests {pull}47353[#47353]
* Ignore replication for noop updates {pull}46458[#46458] (issues: {issue}41065[#41065], {issue}44603[#44603], {issue}46366[#46366])
Client::
* Correct default refresh policy for security APIs {pull}46896[#46896]
Cluster Coordination::
* Ignore metadata of deleted indices at start {pull}48918[#48918]
* Omit writing index metadata for non-replicated closed indices on data-only node {pull}47285[#47285] (issue: {issue}47276[#47276])
* Assert no exceptions during state application {pull}47090[#47090] (issue: {issue}47038[#47038])
* Remove trailing comma from nodes lists {pull}46484[#46484]
Distributed::
* Closed shard should never open new engine {pull}47186[#47186] (issues: {issue}45263[#45263], {issue}47060[#47060])
* Fix false positive out of sync warning in synced-flush {pull}46576[#46576] (issues: {issue}28464[#28464], {issue}30244[#30244])
* Suppress warning logs from background sync on relocated primary {pull}46247[#46247] (issues: {issue}40800[#40800], {issue}42241[#42241])
Engine::
* Greedily advance safe commit on new global checkpoint {pull}48559[#48559] (issue: {issue}48532[#48532])
Features/ILM+SLM::
* Don't halt policy execution on policy trigger exception {pull}49128[#49128]
* Don't schedule SLM jobs when services have been stopped {pull}48658[#48658] (issue: {issue}47749[#47749])
* Ensure SLM stats does not block an in-place upgrade from 7.4 {pull}48367[#48367]
* Ensure SLM stats does not block an in-place upgrade from 7.4 {pull}48361[#48361]
* Add SLM support to xpack usage and info APIs {pull}48096[#48096] (issue: {issue}43663[#43663])
* Change policy_id to list type in slm.get_lifecycle {pull}47766[#47766] (issue: {issue}47765[#47765])
* Throw error retrieving non-existent SLM policy {pull}47679[#47679] (issue: {issue}47664[#47664])
* Handle partial failure retrieving segments in SegmentCountStep {pull}46556[#46556]
* Fixes for API specification {pull}46522[#46522]
Features/Indices APIs::
* Fix Rollover error when alias has closed indices {pull}47148[#47148] (issue: {issue}47146[#47146])
Features/Ingest::
* Do not wrap ingest processor exception with IAE {pull}48816[#48816] (issue: {issue}48810[#48810])
* Introduce dedicated ingest processor exception {pull}48810[#48810] (issue: {issue}48803[#48803])
* Allow dropping documents with auto-generated ID {pull}46773[#46773] (issue: {issue}46678[#46678])
* Expose cache setting in UserAgentPlugin {pull}46533[#46533]
Features/Java High Level REST Client::
* fix incorrect comparison {pull}48208[#48208]
* Fix ILM HLRC Javadoc->Documentation links {pull}48083[#48083]
* Change HLRC count request to accept a QueryBuilder {pull}46904[#46904] (issue: {issue}46829[#46829])
* [HLRC] Send min_score as query string parameter to the count API {pull}46829[#46829] (issue: {issue}46474[#46474])
* HLRC multisearchTemplate forgot params {pull}46492[#46492] (issue: {issue}46488[#46488])
* Added fields for MultiTermVectors (#42232) {pull}42877[#42877] (issue: {issue}42232[#42232])
Features/Java Low Level REST Client::
* Update http-core and http-client dependencies {pull}46549[#46549] (issues: {issue}45379[#45379], {issue}45577[#45577], {issue}45808[#45808])
Features/Monitoring::
* [Monitoring] Add new cluster privilege now necessary for the stack monitoring ui {pull}47871[#47871]
* Validating monitoring hosts setting while parsing {pull}47246[#47246] (issue: {issue}47125[#47125])
Features/Watcher::
* Fix class used to initialize logger in Watcher {pull}46467[#46467]
* Fix wrong URL encoding in watcher HTTP client {pull}45894[#45894] (issue: {issue}44970[#44970])
* Prevent deadlock by using separate schedulers {pull}48697[#48697] (issues: {issue}41451[#41451], {issue}47599[#47599])
* Fix cluster alert for watcher/monitoring IndexOutOfBoundsExcep… {pull}45308[#45308] (issue: {issue}43184[#43184])
Geo::
* Geo: implement proper handling of out of bounds geo points {pull}47734[#47734] (issue: {issue}43916[#43916])
* Geo: Fixes indexing of linestrings that go around the globe {pull}47471[#47471] (issues: {issue}43826[#43826], {issue}43837[#43837])
* Provide better error when updating geo_shape field mapper settings {pull}47281[#47281] (issue: {issue}47006[#47006])
* Geo: fix indexing of west to east linestrings crossing the antimeridian {pull}46601[#46601] (issue: {issue}43775[#43775])
* Reset queryGeometry in ShapeQueryTests {pull}45974[#45974] (issue: {issue}45628[#45628])
Highlighting::
* Fix highlighting of overlapping terms in the unified highlighter {pull}47227[#47227]
* Fix highlighting for script_score query {pull}46507[#46507] (issue: {issue}46471[#46471])
Infra/Core::
* Don't drop user's MaxDirectMemorySize flag on jdk8/windows {pull}48657[#48657] (issues: {issue}44174[#44174], {issue}48365[#48365])
* Warn when MaxDirectMemorySize may be incorrect (Windows/JDK8 only issue) {pull}48365[#48365] (issue: {issue}47384[#47384])
* Support optional parsers in any order with DateMathParser and roundup {pull}46654[#46654] (issue: {issue}45284[#45284])
Infra/Logging::
* SearchSlowLog uses a non thread-safe object to escape json {pull}48363[#48363] (issues: {issue}44642[#44642], {issue}48358[#48358])
Infra/Scripting::
* Drop stored scripts with the old style-id {pull}48078[#48078] (issue: {issue}47593[#47593])
Machine Learning::
* [ML] Fixes for stop datafeed edge cases {pull}49191[#49191] (issues: {issue}43670[#43670], {issue}48931[#48931])
* [ML] Avoid NPE when node load is calculated on job assignment {pull}49186[#49186] (issue: {issue}49150[#49150])
* Do not throw exceptions resulting from persisting datafeed timing stats. {pull}49044[#49044] (issue: {issue}49032[#49032])
* [ML] Deduplicate multi-fields for data frame analytics {pull}48799[#48799] (issues: {issue}48756[#48756], {issue}48770[#48770])
* [ML] Prevent fetching multi-field from source {pull}48770[#48770] (issue: {issue}48756[#48756])
* [ML] Fix detection of syslog-like timestamp in find_file_structure {pull}47970[#47970]
* Fix serialization of evaluation response. {pull}47557[#47557]
* [ML] Reinstate ML daily maintenance actions {pull}47103[#47103] (issue: {issue}47003[#47003])
* [ML] fix two datafeed flush lockup bugs {pull}46982[#46982]
Network::
* Fix es.http.cname_in_publish_address Deprecation Logging {pull}47451[#47451] (issue: {issue}47436[#47436])
Recovery::
* Ignore Lucene index in peer recovery if translog corrupted {pull}49114[#49114]
Reindex::
* Fix issues with serializing BulkByScrollResponse {pull}45357[#45357]
SQL::
* SQL: Fix issue with mins & hours for DATEDIFF {pull}49252[#49252]
* SQL: Fix issue with negative literels and parentheses {pull}48113[#48113] (issue: {issue}48009[#48009])
* SQL: add "format" for "full" date range queries {pull}48073[#48073] (issue: {issue}48033[#48033])
* SQL: Fix arg verification for DateAddProcessor {pull}48041[#48041]
* SQL: Fix Nullability of DATEADD {pull}47921[#47921]
* SQL: Allow whitespaces in escape patterns {pull}47577[#47577] (issue: {issue}47401[#47401])
* SQL: fix multi full-text functions usage with aggregate functions {pull}47444[#47444] (issue: {issue}47365[#47365])
* SQL: Check case where the pivot limit is reached {pull}47121[#47121] (issue: {issue}47002[#47002])
* SQL: Properly handle indices with no/empty mapping {pull}46775[#46775] (issue: {issue}46757[#46757])
* SQL: improve ResultSet behavior when no rows are available {pull}46753[#46753] (issue: {issue}46750[#46750])
* SQL: use the correct data type for types conversion {pull}46574[#46574] (issue: {issue}46090[#46090])
* SQL: Fix issue with common type resolution {pull}46565[#46565] (issue: {issue}46551[#46551])
* SQL: fix scripting for grouped by datetime functions {pull}46421[#46421] (issue: {issue}40241[#40241])
* SQL: Use null schema response {pull}46386[#46386] (issue: {issue}46381[#46381])
* SQL: Fix issue with IIF function when condition folds {pull}46290[#46290] (issue: {issue}46268[#46268])
* SQL: Fix issue with DataType for CASE with NULL {pull}46173[#46173] (issue: {issue}46032[#46032])
* SQL: Failing Group By queries due to different ExpressionIds {pull}43072[#43072] (issues: {issue}33361[#33361], {issue}34543[#34543], {issue}36074[#36074], {issue}37044[#37044], {issue}40001[#40001], {issue}40240[#40240], {issue}41159[#41159], {issue}42041[#42041], {issue}46316[#46316])
* SQL: wrong number of values for columns {pull}42122[#42122]
Search::
* Lucene#asSequentialBits gets the leadCost backwards. {pull}48335[#48335]
* Ensure that we don't call listener twice when detecting a partial failures in _search {pull}47694[#47694]
* Fix alias field resolution in match query {pull}47369[#47369]
* Multi-get requests should wait for search active {pull}46283[#46283] (issue: {issue}27500[#27500])
* Resolve the incorrect scroll_current when delete or close index {pull}45226[#45226]
* Don't apply the plugin's reader wrapper in can_match phase {pull}47816[#47816] (issue: {issue}46817[#46817])
Security::
* Remove uniqueness constraint for API key name and make it optional {pull}47549[#47549] (issue: {issue}46646[#46646])
* Initialize document subset bit set cache used for DLS {pull}46211[#46211] (issue: {issue}45147[#45147])
Snapshot/Restore::
* Fix RepoCleanup not Removed on Master-Failover {pull}49217[#49217]
* Make FsBlobContainer Listing Resilient to Concurrent Modifications {pull}49142[#49142] (issue: {issue}37581[#37581])
* Fix SnapshotShardStatus Reporting for Failed Shard {pull}48556[#48556] (issue: {issue}48526[#48526])
* Cleanup Concurrent RepositoryData Loading {pull}48329[#48329] (issue: {issue}48122[#48122])
* Fix Bug in Azure Repo Exception Handling {pull}47968[#47968]
* Make loadShardSnapshot Exceptions Consistent {pull}47728[#47728] (issue: {issue}47507[#47507])
* Fix Snapshot Corruption in Edge Case {pull}47552[#47552] (issues: {issue}46250[#46250], {issue}47550[#47550])
* Fix Bug in Snapshot Status Response Timestamps {pull}46919[#46919] (issue: {issue}46913[#46913])
* Normalize Blob Store Repo Paths {pull}46869[#46869] (issue: {issue}41814[#41814])
* GCS deleteBlobsIgnoringIfNotExists should catch StorageException {pull}46832[#46832] (issue: {issue}46772[#46772])
* Execute SnapshotsService Error Callback on Generic Thread {pull}46277[#46277]
* Make Snapshot Logic Write Metadata after Segments {pull}45689[#45689] (issue: {issue}41581[#41581])
Store::
* Allow truncation of clean translog {pull}47866[#47866]
Task Management::
* Fix .tasks index strict mapping: parent_id should be parent_task_id {pull}48393[#48393]
Transform::
* [Transform] do not fail checkpoint creation due to global checkpoint mismatch {pull}48423[#48423] (issue: {issue}48379[#48379])
* [7.5][Transform] prevent assignment if any node is older than 7.4 {pull}48055[#48055] (issue: {issue}48019[#48019])
* [Transform] prevent assignment to nodes older than 7.4 {pull}48044[#48044] (issue: {issue}48019[#48019])
* [ML][Transforms] fix bwc serialization with 7.3 {pull}48021[#48021]
* [ML][Transforms] signal listener early on task _stop failure {pull}47954[#47954]
* [ML][Transform] Use field_caps API for mapping deduction {pull}46703[#46703] (issue: {issue}46694[#46694])
* [ML-DataFrame] Fix off-by-one error in checkpoint operations_behind {pull}46235[#46235]
[[regression-7.5.0]]
[float]
=== Regressions
Aggregations::
* Implement rounding optimization for fixed offset timezones {pull}46670[#46670] (issue: {issue}45702[#45702])
Infra/Core::
* [Java.time] Support partial parsing {pull}46814[#46814] (issues: {issue}45284[#45284], {issue}47473[#47473])
* Enable ResolverStyle.STRICT for java formatters {pull}46675[#46675]
[[upgrade-7.5.0]]
[float]
=== Upgrades
Infra/Scripting::
* Update mustache dependency to 0.9.6 {pull}46243[#46243]
Snapshot/Restore::
* Update AWS SDK for repository-s3 plugin to support IAM Roles for Service Accounts {pull}46969[#46969]
* Upgrade to Azure SDK 8.4.0 {pull}46094[#46094]
Store::
* Upgrade to Lucene 8.3. {pull}48829[#48829]
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