## 2023-07-13 Version 2.9.0 Release Notes

## [2.9]

### Added
- [SearchPipeline] Add new search pipeline processor type, SearchPhaseResultsProcessor, that can modify the result of one search phase before starting the next phase.([#7283](https://github.com/opensearch-project/OpenSearch/pull/7283))
- Add task cancellation monitoring service ([#7642](https://github.com/opensearch-project/OpenSearch/pull/7642))
- Add TokenManager Interface ([#7452](https://github.com/opensearch-project/OpenSearch/pull/7452))
- Add Remote store as a segment replication source ([#7653](https://github.com/opensearch-project/OpenSearch/pull/7653))
- Implement concurrent aggregations support without profile option ([#7514](https://github.com/opensearch-project/OpenSearch/pull/7514))
- Add dynamic index and cluster setting for concurrent segment search ([#7956](https://github.com/opensearch-project/OpenSearch/pull/7956))
- Add descending order search optimization through reverse segment read. ([#7967](https://github.com/opensearch-project/OpenSearch/pull/7967))
- [Search pipelines] Added search pipelines output to node stats ([#8053](https://github.com/opensearch-project/OpenSearch/pull/8053))
- Update components of segrep backpressure to support remote store. ([#8020](https://github.com/opensearch-project/OpenSearch/pull/8020))
- Make remote cluster connection setup in async ([#8038](https://github.com/opensearch-project/OpenSearch/pull/8038))
- Add API to initialize extensions ([#8029]()https://github.com/opensearch-project/OpenSearch/pull/8029)
- Add distributed tracing framework ([#7543](https://github.com/opensearch-project/OpenSearch/issues/7543))
- Enable Point based optimization for custom comparators ([#8168](https://github.com/opensearch-project/OpenSearch/pull/8168))
- [Extensions] Support extension additional settings with extension REST initialization ([#8414](https://github.com/opensearch-project/OpenSearch/pull/8414))
- Adds mock implementation for TelemetryPlugin ([#7545](https://github.com/opensearch-project/OpenSearch/issues/7545))
- Support transport action names when registering NamedRoutes ([#7957](https://github.com/opensearch-project/OpenSearch/pull/7957))
- Create concept of persistent ThreadContext headers that are unstashable ([#8291]()https://github.com/opensearch-project/OpenSearch/pull/8291)
- [Search pipelines] Add Global Ignore_failure options for Processors ([#8373](https://github.com/opensearch-project/OpenSearch/pull/8373))
- Enable Partial Flat Object ([#7997](https://github.com/opensearch-project/OpenSearch/pull/7997))
- Add jdk.incubator.vector module support for JDK 20+ ([#8601](https://github.com/opensearch-project/OpenSearch/pull/8601))
- Introduce full support for Search Pipeline ([#8613](https://github.com/opensearch-project/OpenSearch/pull/8613))
- Add partial results support for concurrent segment search ([#8306](https://github.com/opensearch-project/OpenSearch/pull/8306))

### Dependencies
- Bump `com.azure:azure-storage-common` from 12.21.0 to 12.21.1 (#7566, #7814)
- Bump `com.google.guava:guava` from 30.1.1-jre to 32.1.1-jre (#7565, #7811, #7807, #7808, #8402, #8400, #8401, #8581)
- Bump `net.minidev:json-smart` from 2.4.10 to 2.4.11 (#7660, #7812)
- Bump `org.gradle.test-retry` from 1.5.2 to 1.5.3 (#7810)
- Bump `com.diffplug.spotless` from 6.17.0 to 6.18.0 (#7896)
- Bump `jackson` from 2.15.1 to 2.15.2 ([#7897](https://github.com/opensearch-project/OpenSearch/pull/7897))
- Add `com.github.luben:zstd-jni` version 1.5.5-3 ([#2996](https://github.com/opensearch-project/OpenSearch/pull/2996))
- Bump `netty` from 4.1.91.Final to 4.1.93.Final ([#7901](https://github.com/opensearch-project/OpenSearch/pull/7901))
- Bump `com.amazonaws` 1.12.270 to `software.amazon.awssdk` 2.20.55 ([7372](https://github.com/opensearch-project/OpenSearch/pull/7372/))
- Add `org.reactivestreams` 1.0.4 ([7372](https://github.com/opensearch-project/OpenSearch/pull/7372/))
- Bump `com.networknt:json-schema-validator` from 1.0.81 to 1.0.85 ([7968], #8255)
- Bump `com.netflix.nebula:gradle-extra-configurations-plugin` from 9.0.0 to 10.0.0 in /buildSrc ([#7068](https://github.com/opensearch-project/OpenSearch/pull/7068))
- Bump `com.google.guava:guava` from 32.0.0-jre to 32.0.1-jre (#8009)
- Bump `commons-io:commons-io` from 2.12.0 to 2.13.0 (#8014, #8013, #8010)
- Bump `com.diffplug.spotless` from 6.18.0 to 6.19.0 (#8007)
- Bump `'com.azure:azure-storage-blob` to 12.22.2 from 12.21.1 ([#8043](https://github.com/opensearch-project/OpenSearch/pull/8043))
- Bump `org.jruby.joni:joni` from 2.1.48 to 2.2.1 (#8015, #8254)
- Bump `com.google.guava:guava` from 32.0.0-jre to 32.0.1-jre ([#8011](https://github.com/opensearch-project/OpenSearch/pull/8011), [#8012](https://github.com/opensearch-project/OpenSearch/pull/8012), [#8107](https://github.com/opensearch-project/OpenSearch/pull/8107))
- Bump `io.projectreactor:reactor-core` from 3.4.18 to 3.5.6 in /plugins/repository-azure ([#8016](https://github.com/opensearch-project/OpenSearch/pull/8016))
- Bump `spock-core` from 2.1-groovy-3.0 to 2.3-groovy-3.0 ([#8122](https://github.com/opensearch-project/OpenSearch/pull/8122))
- Bump `com.networknt:json-schema-validator` from 1.0.83 to 1.0.84 (#8141)
- Bump `com.netflix.nebula:gradle-info-plugin` from 12.1.3 to 12.1.5 (#8139, #8568)
- Bump `commons-io:commons-io` from 2.12.0 to 2.13.0 in /plugins/discovery-azure-classic ([#8140](https://github.com/opensearch-project/OpenSearch/pull/8140))
- Bump `mockito` from 5.2.0 to 5.4.0 ([#8181](https://github.com/opensearch-project/OpenSearch/pull/8181))
- Bump `netty` from 4.1.93.Final to 4.1.94.Final ([#8191](https://github.com/opensearch-project/OpenSearch/pull/8191))
- Bump `org.apache.hadoop:hadoop-minicluster` from 3.3.5 to 3.3.6 (#8257)
- Bump `io.projectreactor.netty:reactor-netty-http` from 1.1.7 to 1.1.8 (#8256)
- [Upgrade] Lucene 9.7.0 release (#8272)
- Bump `org.jboss.resteasy:resteasy-jackson2-provider` from 3.0.26.Final to 6.2.4.Final in /qa/wildfly ([#8209](https://github.com/opensearch-project/OpenSearch/pull/8209))
- Bump `com.google.api-client:google-api-client` from 1.34.0 to 2.2.0 ([#8276](https://github.com/opensearch-project/OpenSearch/pull/8276))
- Update Apache HttpCore/ HttpClient and Apache HttpCore5 / HttpClient5 dependencies ([#8434](https://github.com/opensearch-project/OpenSearch/pull/8434))
- Bump `org.apache.maven:maven-model` from 3.9.2 to 3.9.3 (#8403)
- Bump `io.projectreactor.netty:reactor-netty` and `io.projectreactor.netty:reactor-netty-core` from 1.1.7 to 1.1.8 (#8405)
- Bump `com.azure:azure-storage-blob` from 12.22.2 to 12.22.3 (#8572)
- Bump `net.minidev:json-smart` from 2.4.11 to 2.5.0 (#8575, #8576)
- Bump `com.google.jimfs:jimfs` from 1.2 to 1.3.0 (#8577, #8571)
- Bump `com.networknt:json-schema-validator` from 1.0.85 to 1.0.86 ([#8573](https://github.com/opensearch-project/OpenSearch/pull/8573))
- Bump `com.google.cloud:google-cloud-core-http` from 2.17.0 to 2.21.0 ([#8586](https://github.com/opensearch-project/OpenSearch/pull/8586))
- Bump `com.google.jimfs:jimfs` from 1.2 to 1.3.0 ([#8585](https://github.com/opensearch-project/OpenSearch/pull/8585))

### Changed
- Replace jboss-annotations-api_1.2_spec with jakarta.annotation-api ([#7836](https://github.com/opensearch-project/OpenSearch/pull/7836))
- Reduce memory copy in zstd compression ([#7681](https://github.com/opensearch-project/OpenSearch/pull/7681))
- Add min, max, average and thread info to resource stats in tasks API ([#7673](https://github.com/opensearch-project/OpenSearch/pull/7673))
- Add ZSTD compression for snapshotting ([#2996](https://github.com/opensearch-project/OpenSearch/pull/2996))
- Change `com.amazonaws.sdk.ec2MetadataServiceEndpointOverride` to `aws.ec2MetadataServiceEndpoint` ([7372](https://github.com/opensearch-project/OpenSearch/pull/7372/))
- Change `com.amazonaws.sdk.stsEndpointOverride` to `aws.stsEndpointOverride` ([7372](https://github.com/opensearch-project/OpenSearch/pull/7372/))
- Add new query profile collector fields with concurrent search execution ([#7898](https://github.com/opensearch-project/OpenSearch/pull/7898))
- Align range and default value for deletes_pct_allowed in merge policy ([#7730](https://github.com/opensearch-project/OpenSearch/pull/7730))
- Rename QueryPhase actors like Suggest, Rescore to be processors rather than phase ([#8025](https://github.com/opensearch-project/OpenSearch/pull/8025))
- Compress and cache cluster state during validate join request ([#7321](https://github.com/opensearch-project/OpenSearch/pull/7321))
- [Snapshot Interop] Add Changes in Create Snapshot Flow for remote store interoperability. ([#7118](https://github.com/opensearch-project/OpenSearch/pull/7118))
- Allow insecure string settings to warn-log usage and advise to migration of a newer secure variant ([#5496](https://github.com/opensearch-project/OpenSearch/pull/5496))
- Add self-organizing hash table to improve the performance of bucket aggregations ([#7652](https://github.com/opensearch-project/OpenSearch/pull/7652))
- Check UTF16 string size before converting to String to avoid OOME ([#7963](https://github.com/opensearch-project/OpenSearch/pull/7963))
- Move ZSTD compression codecs out of the sandbox ([#7908](https://github.com/opensearch-project/OpenSearch/pull/7908))
- Update ZSTD default compression level ([#8471](https://github.com/opensearch-project/OpenSearch/pull/8471))
- [Search Pipelines] Pass pipeline creation context to processor factories ([#8164](https://github.com/opensearch-project/OpenSearch/pull/8164))
- Enabling compression levels for zstd and zstd_no_dict ([#8312](https://github.com/opensearch-project/OpenSearch/pull/8312))
- Optimize Metadata build() to skip redundant computations as part of ClusterState build ([#7853](https://github.com/opensearch-project/OpenSearch/pull/7853))
- Add safeguard limits for file cache during node level allocation ([#8208](https://github.com/opensearch-project/OpenSearch/pull/8208))
- Move span actions to Scope ([#8411](https://github.com/opensearch-project/OpenSearch/pull/8411))
- Add wrapper tracer implementation ([#8565](https://github.com/opensearch-project/OpenSearch/pull/8565))
- Improved performance of parsing floating point numbers ([#7909](https://github.com/opensearch-project/OpenSearch/pull/7909))

### Removed
- Remove `COMPRESSOR` variable from `CompressorFactory` and use `DEFLATE_COMPRESSOR` instead ([7907](https://github.com/opensearch-project/OpenSearch/pull/7907))
- Remove concurrency based minimum file cache size restriction ([#8294](https://github.com/opensearch-project/OpenSearch/pull/8294))

### Fixed
- Fixing error: adding a new/forgotten parameter to the configuration for checking the config on startup in plugins/repository-s3 #7924
- Enforce 512 byte document ID limit in bulk updates ([#8039](https://github.com/opensearch-project/OpenSearch/pull/8039))
- With only GlobalAggregation in request causes unnecessary wrapping with MultiCollector ([#8125](https://github.com/opensearch-project/OpenSearch/pull/8125))
- Fix mapping char_filter when mapping a hashtag ([#7591](https://github.com/opensearch-project/OpenSearch/pull/7591))
- Fix NPE in multiterms aggregations involving empty buckets ([#7318](https://github.com/opensearch-project/OpenSearch/pull/7318))
- Precise system clock time in MasterService debug logs ([#7902](https://github.com/opensearch-project/OpenSearch/pull/7902))
- Improve indexing performance for flat_object type ([#7855](https://github.com/opensearch-project/OpenSearch/pull/7855))
- Adds log4j configuration for telemetry LogSpanExporter ([#8393](https://github.com/opensearch-project/OpenSearch/pull/8393))
- Fix painless casting bug, which crashes the OpenSearch process ([#8315](https://github.com/opensearch-project/OpenSearch/pull/8315))
- Add missing validation/parsing of SearchBackpressureMode of SearchBackpressureSettings ([#7541](https://github.com/opensearch-project/OpenSearch/pull/7541))