Fix CHANGELOG entry to add it to 2.x instead of 3.0

Author: rishabhmaurya

CHANGELOG.md

@@ -21,7 +21,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Tracing for deep search path ([#12103](https://github.com/opensearch-project/OpenSearch/pull/12103))
 - Add explicit dependency to validatePom and generatePom tasks ([#12807](https://github.com/opensearch-project/OpenSearch/pull/12807))
 - Replace configureEach with all for publication iteration ([#12876](https://github.com/opensearch-project/OpenSearch/pull/12876))
-- Derived fields support to derive field values at query time without indexing ([#12569](https://github.com/opensearch-project/OpenSearch/pull/12569))
 
 ### Dependencies
 - Bump `log4j-core` from 2.18.0 to 2.19.0
@@ -111,6 +110,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Allow setting KEYSTORE_PASSWORD through env variable ([#12865](https://github.com/opensearch-project/OpenSearch/pull/12865))
 - [Concurrent Segment Search] Perform buildAggregation concurrently and support Composite Aggregations ([#12697](https://github.com/opensearch-project/OpenSearch/pull/12697))
 - [Concurrent Segment Search] Disable concurrent segment search for system indices and throttled requests ([#12954](https://github.com/opensearch-project/OpenSearch/pull/12954))
+- Derived fields support to derive field values at query time without indexing ([#12569](https://github.com/opensearch-project/OpenSearch/pull/12569))
 
 ### Dependencies
 - Bump `org.apache.commons:commons-configuration2` from 2.10.0 to 2.10.1 ([#12896](https://github.com/opensearch-project/OpenSearch/pull/12896))