[2.19] Clear out changelog for the 2.19.5 release (#20828)

Signed-off-by: Andrew Ross <andrross@amazon.com>
Signed-off-by: Ankit Jain <jainankitk@apache.org>
Co-authored-by: Ankit Jain <jainankitk@apache.org>

Author: andrross

CHANGELOG.md

@@ -7,22 +7,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Added
 
 ### Dependencies
-- Bump `log4j` from 2.21.0 to 2.25.3 ([#20308](https://github.com/opensearch-project/OpenSearch/pull/20308))
-- Bump netty from 4.1.125.Final to 4.1.131.Final ([#20744](https://github.com/opensearch-project/OpenSearch/pull/20744))
-- Bump shadow-gradle-plugin from 8.1.1 to 8.3.10 ([#20569](https://github.com/opensearch-project/OpenSearch/pull/20569))
-- Bump Jackson from 2.18.2 to 2.18.6 ([#20813](https://github.com/opensearch-project/OpenSearch/pull/20813))
-- Update HDFS test fixture dependencies ([#20768](https://github.com/opensearch-project/OpenSearch/pull/20768))
 
 ### Deprecated
 
 ### Removed
 
 ### Fixed
-- Fix segment replication failure during rolling restart ([#19234](https://github.com/opensearch-project/OpenSearch/issues/19234))
 - Harden the circuit breaker and failure handle logic in query result consumer ([#19396](https://github.com/opensearch-project/OpenSearch/pull/19396))
-- Fix SearchPhaseExecutionException to properly initCause ([#20336](https://github.com/opensearch-project/OpenSearch/pull/20336))
 
 ### Security
 
 ### Changed
-- Make XContentMapValues.filter case insensitive ([#19976](https://github.com/opensearch-project/OpenSearch/pull/19976))