## 2022-11-04 Version 2.4.0 Release Notes

## [2.4]
### Added
- Introduce point in time search feature ([#3959](https://github.com/opensearch-project/OpenSearch/issues/3959))
- Introduce experimental searchable snapshot feature ([#2919](https://github.com/opensearch-project/OpenSearch/issues/2919))
- Add API for decommissioning/recommissioning zone and weighted zonal search request routing policy ([#3639](https://github.com/opensearch-project/OpenSearch/issues/3639))
- Add support for s390x architecture ([#4001](https://github.com/opensearch-project/OpenSearch/pull/4001))
- Github workflow for changelog verification ([#4085](https://github.com/opensearch-project/OpenSearch/pull/4085))
- Add failover support with Segment Replication enabled. ([#4325](https://github.com/opensearch-project/OpenSearch/pull/4325)
- Add a new node role 'search' which is dedicated to provide search capability ([#4689](https://github.com/opensearch-project/OpenSearch/pull/4689))
- Introduce Remote translog feature flag([#4158](https://github.com/opensearch-project/OpenSearch/pull/4158))
- Add groupId value propagation tests for ZIP publication task ([#4848](https://github.com/opensearch-project/OpenSearch/pull/4848))
- Add support for GeoJson Point type in GeoPoint field ([#4597](https://github.com/opensearch-project/OpenSearch/pull/4597))
- Add missing no-jdk distributions ([#4722](https://github.com/opensearch-project/OpenSearch/pull/4722))
- Copy `build.sh` over from opensearch-build ([#4887](https://github.com/opensearch-project/OpenSearch/pull/4887))
- Update GeoGrid base class access modifier to support extensibility ([#4921](https://github.com/opensearch-project/OpenSearch/pull/4921))
- Build no-jdk distributions as part of release build ([#4902](https://github.com/opensearch-project/OpenSearch/pull/4902))
- Add in-flight cancellation of SearchShardTask based on resource consumption ([#4565](https://github.com/opensearch-project/OpenSearch/pull/4565))
- Add resource usage trackers for in-flight cancellation of SearchShardTask ([#4805](https://github.com/opensearch-project/OpenSearch/pull/4805))
- Add search backpressure stats API ([#4932](https://github.com/opensearch-project/OpenSearch/pull/4932))
- Add feature to ignore indexes starting with dot during shard limit validation.([#4695](https://github.com/opensearch-project/OpenSearch/pull/4695))

### Dependencies
- Bump `com.diffplug.spotless` from 6.9.1 to 6.10.0
- Bump `xmlbeans` from 5.1.0 to 5.1.1
- Bump `hadoop-hdfs` from 3.3.3 to 3.3.4
- Exclude jettison version brought in with hadoop-minicluster. ([#4787](https://github.com/opensearch-project/OpenSearch/pull/4787))
- Bump protobuf-java to 3.21.7 in repository-gcs and repository-hdfs ([#4790](https://github.com/opensearch-project/OpenSearch/pull/4790))
- Bump reactor-netty-http to 1.0.24 in repository-azure ([#4880](https://github.com/opensearch-project/OpenSearch/pull/4880))
- Add dev help in gradle check CI failures ([4872](https://github.com/opensearch-project/OpenSearch/pull/4872))
- Upgrade netty to 4.1.84.Final ([#4893](https://github.com/opensearch-project/OpenSearch/pull/4893))
- Dependency updates: asm 9.3 -> 9.4, bytebuddy 1.12.12 -> 1.12.18 ([#4889](https://github.com/opensearch-project/OpenSearch/pull/4889))
- Bump `tika` from 2.4.0 to 2.5.0 ([#4791](https://github.com/opensearch-project/OpenSearch/pull/4791))
- Update Apache Lucene to 9.4.1 ([#4922](https://github.com/opensearch-project/OpenSearch/pull/4922))
- Bump `woodstox-core` to 6.4.0 ([#4951](https://github.com/opensearch-project/OpenSearch/pull/4951))
- Upgrade jetty-http, kotlin-stdlib and snakeyaml ([#4982](https://github.com/opensearch-project/OpenSearch/pull/4982))
- OpenJDK Update (October 2022 Patch releases) ([#4997](https://github.com/opensearch-project/OpenSearch/pull/4997))
- Upgrade zookeeper dependency in hdfs-fixture ([#5007](https://github.com/opensearch-project/OpenSearch/pull/5007))
- Dependency updates (httpcore, mockito, slf4j, httpasyncclient, commons-codec) ([#4308](https://github.com/opensearch-project/OpenSearch/pull/4308))
- Update to Apache Lucene 9.4.0 ([#4661](https://github.com/opensearch-project/OpenSearch/pull/4661))
- Updated jackson to 2.13.4 and snakeyml to 1.32 ([#4556](https://github.com/opensearch-project/OpenSearch/pull/4556))
- Update Jackson Databind to 2.13.4.2 (addressing CVE-2022-42003) ([#4781](https://github.com/opensearch-project/OpenSearch/pull/4781))
- Bump protobuf-java to 3.21.8 ([#5005](https://github.com/opensearch-project/OpenSearch/pull/5005))
- Upgrade zookeeper dependency in hdfs-fixture ([#5047](https://github.com/opensearch-project/OpenSearch/pull/5047))

### Changed
- Use RemoteSegmentStoreDirectory instead of RemoteDirectory ([#4240](https://github.com/opensearch-project/OpenSearch/pull/4240))
- Weighted round-robin scheduling policy for shard coordination traffic ([#4241](https://github.com/opensearch-project/OpenSearch/pull/4241))
- Add index specific setting for remote repository ([#4253](https://github.com/opensearch-project/OpenSearch/pull/4253))
- Update replicas to commit SegmentInfos instead of relying on SIS files from primary shards. ([#4402](https://github.com/opensearch-project/OpenSearch/pull/4402))
- Change the version to remove deprecated code of adding node name into log pattern of log4j property file ([#4569](https://github.com/opensearch-project/OpenSearch/pull/4569))
- Load the deprecated master role in a dedicated method instead of in setAdditionalRoles() ([#4582](https://github.com/opensearch-project/OpenSearch/pull/4582))
- Plugin ZIP publication groupId value is configurable ([#4156](https://github.com/opensearch-project/OpenSearch/pull/4156))
- Further simplification of the ZIP publication implementation ([#4360](https://github.com/opensearch-project/OpenSearch/pull/4360))
- Change behaviour in replica recovery for remote translog enabled indices ([#4318](https://github.com/opensearch-project/OpenSearch/pull/4318))
- PUT api for weighted shard routing ([#4272](https://github.com/opensearch-project/OpenSearch/pull/4272))
- GET api for weighted shard routing([#4275](https://github.com/opensearch-project/OpenSearch/pull/4275/))
- Delete api for weighted shard routing([#4400](https://github.com/opensearch-project/OpenSearch/pull/4400/))
- Fix weighted routing metadata deserialization error on process restart ([#4691](https://github.com/opensearch-project/OpenSearch/pull/4691))
- Install and configure Log4j JUL Adapter for Lucene 9.4 ([#4754](https://github.com/opensearch-project/OpenSearch/pull/4754))
- Use getParameterCount instead of getParameterTypes ([#4821](https://github.com/opensearch-project/OpenSearch/pull/4821))

### Removed
- Remove RepositoryData.MIN_VERSION support for next major release ([4729](https://github.com/opensearch-project/OpenSearch/pull/4729))

### Fixed
- `opensearch-service.bat start` and `opensearch-service.bat manager` failing to run ([#4289](https://github.com/opensearch-project/OpenSearch/pull/4289))
- PR reference to checkout code for changelog verifier ([#4296](https://github.com/opensearch-project/OpenSearch/pull/4296))
- `opensearch.bat` and `opensearch-service.bat install` failing to run, missing logs directory ([#4305](https://github.com/opensearch-project/OpenSearch/pull/4305))
- Restore using the class ClusterInfoRequest and ClusterInfoRequestBuilder from package 'org.opensearch.action.support.master.info' for subclasses ([#4307](https://github.com/opensearch-project/OpenSearch/pull/4307))
- Do not fail replica shard due to primary closure ([#4133](https://github.com/opensearch-project/OpenSearch/pull/4133))
- Fixed cancellation of segment replication events ([#4225](https://github.com/opensearch-project/OpenSearch/pull/4225))
- `opensearch.bat` fails to execute when install path includes spaces ([#4362](https://github.com/opensearch-project/OpenSearch/pull/4362))
- Getting security exception due to access denied 'java.lang.RuntimePermission' 'accessDeclaredMembers' when trying to get snapshot with S3 IRSA ([#4469](https://github.com/opensearch-project/OpenSearch/pull/4469))
- Fix the ignore_malformed setting to also ignore objects ([#4494](https://github.com/opensearch-project/OpenSearch/pull/4494))
- Fix day of year defaulting for round up parser ([#4627](https://github.com/opensearch-project/OpenSearch/pull/4627))
- Fix the SnapshotsInProgress error during index deletion ([#4570](https://github.com/opensearch-project/OpenSearch/pull/4570))
- Fix invalid location of JDK dependency for arm64 architecture([#4613](https://github.com/opensearch-project/OpenSearch/pull/4613))
- Alias filter lost after rollover ([#4499](https://github.com/opensearch-project/OpenSearch/pull/4499))
- Fix Gradle warnings associated with publishPluginZipPublicationToXxx tasks ([#4696](https://github.com/opensearch-project/OpenSearch/pull/4696))
- Fix a bug on handling an invalid array value for point type field #4900([#4900](https://github.com/opensearch-project/OpenSearch/pull/4900))
- Set analyzer to regex query string search ([4219](https://github.com/opensearch-project/OpenSearch/pull/4219))
- Better plural stemmer than minimal_english ([#4738](https://github.com/opensearch-project/OpenSearch/pull/4738))
- Add check to cancel ongoing replication with old primary on onNewCheckpoint on replica ([#4363](https://github.com/opensearch-project/OpenSearch/pull/4363))
- Bump segment infos counter before commit during replica promotion ([#4365](https://github.com/opensearch-project/OpenSearch/pull/4365))
- Update flaky testOnNewCheckpointFromNewPrimaryCancelOngoingReplication unit test ([#4414](https://github.com/opensearch-project/OpenSearch/pull/4414))
- Extend FileChunkWriter to allow cancel on transport client ([#4386](https://github.com/opensearch-project/OpenSearch/pull/4386))
- Fix NoSuchFileExceptions with segment replication when computing primary metadata snapshots ([#4366](https://github.com/opensearch-project/OpenSearch/pull/4366))
- Fix timeout issue by calculating time needed to process getSegmentFiles ([#4434](https://github.com/opensearch-project/OpenSearch/pull/4434))
- Update replicas to commit SegmentInfos instead of relying on segments_N from primary shards ([#4450](https://github.com/opensearch-project/OpenSearch/pull/4450))
- Adding check to make sure checkpoint is not processed when a shard's shard routing is primary ([#4716](https://github.com/opensearch-project/OpenSearch/pull/4716))
- Fix bug of replica shard's translog not purging on index flush when segment replication is enabled ([4975](https://github.com/opensearch-project/OpenSearch/pull/4975))
- Fix message "No OpenSearchException found" when detailed_error disabled by return meaningful messages ([#4708](https://github.com/opensearch-project/OpenSearch/pull/4708))
- Add fix for auto expand replica validation ([#4994](https://github.com/opensearch-project/OpenSearch/pull/4994))
- Fix build failures on the Windows platform ([#4924](https://github.com/opensearch-project/OpenSearch/issues/4924))
- Fix error handling while reading analyzer mapping rules ([6d20423](https://github.com/opensearch-project/OpenSearch/commit/6d20423f5920745463b1abc5f1daf6a786c41aa0))

### Security
- Fixes CVE-2022-41917 ([#5141](https://github.com/opensearch-project/OpenSearch/pull/5141))
- CVE-2022-25857 org.yaml:snakeyaml DOS vulnerability ([#4341](https://github.com/opensearch-project/OpenSearch/pull/4341))