Clear out 2.x section of changelog (opensearch-project#12870)

The 2.13 release notes have been created.

Signed-off-by: Andrew Ross <andrross@amazon.com>

Author: andrross

CHANGELOG.md

@@ -5,79 +5,16 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased 2.x]
 ### Added
-- [Tiered caching] Introducing cache plugins and exposing Ehcache as one of the pluggable disk cache option ([#11874](https://github.com/opensearch-project/OpenSearch/pull/11874))
-- Add support for dependencies in plugin descriptor properties with semver range ([#11441](https://github.com/opensearch-project/OpenSearch/pull/11441))
-- Add community_id ingest processor ([#12121](https://github.com/opensearch-project/OpenSearch/pull/12121))
-- Introduce query level setting `index.query.max_nested_depth` limiting nested queries ([#3268](https://github.com/opensearch-project/OpenSearch/issues/3268)
-- Add toString methods to MultiSearchRequest, MultiGetRequest and CreateIndexRequest ([#12163](https://github.com/opensearch-project/OpenSearch/pull/12163))
-- Fix error in RemoteSegmentStoreDirectory when debug logging is enabled ([#12328](https://github.com/opensearch-project/OpenSearch/pull/12328))
-- Support for returning scores in matched queries ([#11626](https://github.com/opensearch-project/OpenSearch/pull/11626))
-- Add shard id property to SearchLookup for use in field types provided by plugins ([#1063](https://github.com/opensearch-project/OpenSearch/pull/1063))
-- [Tiered caching] Make IndicesRequestCache implementation configurable [EXPERIMENTAL] ([#12533](https://github.com/opensearch-project/OpenSearch/pull/12533))
-- Force merge API supports performing on primary shards only ([#11269](https://github.com/opensearch-project/OpenSearch/pull/11269))
-- Add kuromoji_completion analyzer and filter ([#4835](https://github.com/opensearch-project/OpenSearch/issues/4835))
-- [Admission Control] Integrate IO Usage Tracker to the Resource Usage Collector Service and Emit IO Usage Stats ([#11880](https://github.com/opensearch-project/OpenSearch/pull/11880))
-- The org.opensearch.bootstrap.Security should support codebase for JAR files with classifiers ([#12586](https://github.com/opensearch-project/OpenSearch/issues/12586))
-- Remote reindex: Add support for configurable retry mechanism ([#12561](https://github.com/opensearch-project/OpenSearch/pull/12561))
-- Tracing for deep search path ([#12103](https://github.com/opensearch-project/OpenSearch/pull/12103))
-- [Metrics Framework] Adds support for asynchronous gauge metric type. ([#12642](https://github.com/opensearch-project/OpenSearch/issues/12642))
-- [Tiered caching] Add Stale keys Management and CacheCleaner to IndicesRequestCache ([#12625](https://github.com/opensearch-project/OpenSearch/pull/12625))
-- Make search query counters dynamic to support all query types ([#12601](https://github.com/opensearch-project/OpenSearch/pull/12601))
-- [Tiered caching] Add policies controlling which values can enter pluggable caches [EXPERIMENTAL] ([#12542](https://github.com/opensearch-project/OpenSearch/pull/12542))
-- [Tiered caching] Add serializer integration to allow ehcache disk cache to use non-primitive values ([#12709](https://github.com/opensearch-project/OpenSearch/pull/12709))
-- [Admission Control] Integrated IO Based AdmissionController to AdmissionControl Framework ([#12583](https://github.com/opensearch-project/OpenSearch/pull/12583))
-- Add Remote Store Migration Experimental flag and allow mixed mode clusters under same ([#11986](https://github.com/opensearch-project/OpenSearch/pull/11986))
-- Built-in secure transports support ([#12435](https://github.com/opensearch-project/OpenSearch/pull/12435))
-- Lightweight Transport action to verify local term before fetching cluster-state from remote ([#12252](https://github.com/opensearch-project/OpenSearch/pull/12252/))
-- Integrate with admission controller for cluster-manager Read API. ([#12496](https://github.com/opensearch-project/OpenSearch/pull/12496))
-- Introduce a new setting `index.check_pending_flush.enabled` to expose the ability to disable the check for pending flushes by write threads ([#12710](https://github.com/opensearch-project/OpenSearch/pull/12710))
 
 ### Dependencies
-- Bump `com.squareup.okio:okio` from 3.7.0 to 3.8.0 ([#12290](https://github.com/opensearch-project/OpenSearch/pull/12290))
-- Bump `org.bouncycastle:bcprov-jdk15to18` to `org.bouncycastle:bcprov-jdk18on` version 1.77 ([#12326](https://github.com/opensearch-project/OpenSearch/pull/12326))
-- Bump `org.bouncycastle:bcmail-jdk15to18` to `org.bouncycastle:bcmail-jdk18on` version 1.77 ([#12326](https://github.com/opensearch-project/OpenSearch/pull/12326))
-- Bump `org.bouncycastle:bcpkix-jdk15to18` to `org.bouncycastle:bcpkix-jdk18on` version 1.77 ([#12326](https://github.com/opensearch-project/OpenSearch/pull/12326))
-- Bump `gradle/wrapper-validation-action` from 1 to 2 ([#12367](https://github.com/opensearch-project/OpenSearch/pull/12367))
-- Bump `netty` from 4.1.106.Final to 4.1.107.Final ([#12372](https://github.com/opensearch-project/OpenSearch/pull/12372))
-- Bump `opentelemetry` from 1.34.1 to 1.36.0 ([#12388](https://github.com/opensearch-project/OpenSearch/pull/12388), [#12618](https://github.com/opensearch-project/OpenSearch/pull/12618))
-- Bump Apache Lucene from 9.9.2 to 9.10.0 ([#12392](https://github.com/opensearch-project/OpenSearch/pull/12392))
-- Bump `org.apache.logging.log4j:log4j-core` from 2.22.1 to 2.23.1 ([#12464](https://github.com/opensearch-project/OpenSearch/pull/12464), [#12587](https://github.com/opensearch-project/OpenSearch/pull/12587))
-- Bump `antlr4` from 4.11.1 to 4.13.1 ([#12445](https://github.com/opensearch-project/OpenSearch/pull/12445))
-- Bump `com.netflix.nebula.ospackage-base` from 11.8.0 to 11.8.1 ([#12461](https://github.com/opensearch-project/OpenSearch/pull/12461))
-- Bump `peter-evans/create-or-update-comment` from 3 to 4 ([#12462](https://github.com/opensearch-project/OpenSearch/pull/12462))
-- Bump `lycheeverse/lychee-action` from 1.9.1 to 1.9.3 ([#12521](https://github.com/opensearch-project/OpenSearch/pull/12521))
-- Bump `com.azure:azure-core` from 1.39.0 to 1.47.0 ([#12520](https://github.com/opensearch-project/OpenSearch/pull/12520))
-- Bump `ch.qos.logback:logback-core` from 1.2.13 to 1.5.3 ([#12519](https://github.com/opensearch-project/OpenSearch/pull/12519))
-- Bump `codecov/codecov-action` from 3 to 4 ([#12585](https://github.com/opensearch-project/OpenSearch/pull/12585))
-- Bump `org.apache.zookeeper:zookeeper` from 3.9.1 to 3.9.2 ([#12580](https://github.com/opensearch-project/OpenSearch/pull/12580))
-- Bump `org.codehaus.woodstox:stax2-api` from 4.2.1 to 4.2.2 ([#12579](https://github.com/opensearch-project/OpenSearch/pull/12579))
-- Bump Jackson version from 2.16.1 to 2.17.0 ([#12611](https://github.com/opensearch-project/OpenSearch/pull/12611), [#12662](https://github.com/opensearch-project/OpenSearch/pull/12662))
-- Bump `reactor-netty` from 1.1.15 to 1.1.17 ([#12633](https://github.com/opensearch-project/OpenSearch/pull/12633))
-- Bump `reactor` from 3.5.14 to 3.5.15 ([#12633](https://github.com/opensearch-project/OpenSearch/pull/12633))
-- Bump `aws-sdk-java` from 2.20.55 to 2.20.86 ([#12251](https://github.com/opensearch-project/OpenSearch/pull/12251))
 
 ### Changed
-- Allow composite aggregation to run under a parent filter aggregation ([#11499](https://github.com/opensearch-project/OpenSearch/pull/11499))
-- Quickly compute terms aggregations when the top-level query is functionally match-all for a segment ([#11643](https://github.com/opensearch-project/OpenSearch/pull/11643))
-- Mark fuzzy filter GA and remove experimental setting ([12631](https://github.com/opensearch-project/OpenSearch/pull/12631))
-- Keep the election scheduler open until cluster state has been applied ([#11699](https://github.com/opensearch-project/OpenSearch/pull/11699))
 
 ### Deprecated
 
 ### Removed
 
 ### Fixed
-- [Revert] [Bug] Check phase name before SearchRequestOperationsListener onPhaseStart ([#12035](https://github.com/opensearch-project/OpenSearch/pull/12035))
-- Add support of special WrappingSearchAsyncActionPhase so the onPhaseStart() will always be followed by onPhaseEnd() within AbstractSearchAsyncAction ([#12293](https://github.com/opensearch-project/OpenSearch/pull/12293))
-- Add a system property to configure YamlParser codepoint limits ([#12298](https://github.com/opensearch-project/OpenSearch/pull/12298))
-- Prevent read beyond slice boundary in ByteArrayIndexInput ([#10481](https://github.com/opensearch-project/OpenSearch/issues/10481))
-- Fix the "highlight.max_analyzer_offset" request parameter with "plain" highlighter ([#10919](https://github.com/opensearch-project/OpenSearch/pull/10919))
-- Prevent unnecessary fetch sub phase processor initialization during fetch phase execution ([#12503](https://github.com/opensearch-project/OpenSearch/pull/12503))
-- Fix `terms` query on `float` field when `doc_values` are turned off by reverting back to `FloatPoint` from `FloatField` ([#12499](https://github.com/opensearch-project/OpenSearch/pull/12499))
-- Fix get task API does not refresh resource stats ([#11531](https://github.com/opensearch-project/OpenSearch/pull/11531))
-- Fix for deserilization bug in weighted round-robin metadata ([#11679](https://github.com/opensearch-project/OpenSearch/pull/11679))
-- onShardResult and onShardFailure are executed on one shard causes opensearch jvm crashed ([#12158](https://github.com/opensearch-project/OpenSearch/pull/12158))
-- Avoid overflow when sorting missing last on `epoch_millis` datetime field ([#12676](https://github.com/opensearch-project/OpenSearch/pull/12676))
 
 ### Security