Move CHANGELOG entry for opensearch-project#13860 to CHANGELOG 3.0 (opensearch-project#13874)

Signed-off-by: Craig Perkins <cwperx@amazon.com>

Author: cwperks

CHANGELOG-3.0.md

@@ -24,6 +24,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add task completion count in search backpressure stats API ([#10028](https://github.com/opensearch-project/OpenSearch/pull/10028/))
 - Deprecate CamelCase `PathHierarchy` tokenizer name in favor to lowercase `path_hierarchy` ([#10894](https://github.com/opensearch-project/OpenSearch/pull/10894))
 - Breaking change: Do not request "search_pipelines" metrics by default in NodesInfoRequest ([#12497](https://github.com/opensearch-project/OpenSearch/pull/12497))
+- Remove deprecated constant META_FIELDS_BEFORE_7DOT8 ([#13860](https://github.com/opensearch-project/OpenSearch/pull/13860))
 
 ### Deprecated
 

CHANGELOG.md

@@ -13,7 +13,6 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Remote Store] Upload translog checkpoint as object metadata to translog.tlog([#13637](https://github.com/opensearch-project/OpenSearch/pull/13637))
 - Add getMetadataFields to MapperService ([#13819](https://github.com/opensearch-project/OpenSearch/pull/13819))
 - [Remote State] Add async remote state deletion task running on an interval, configurable by a setting ([#13131](https://github.com/opensearch-project/OpenSearch/pull/13131))
-- Remove deprecated constant META_FIELDS_BEFORE_7DOT8 ([#13860](https://github.com/opensearch-project/OpenSearch/pull/13860))
 
 ### Dependencies
 - Bump `com.github.spullara.mustache.java:compiler` from 0.9.10 to 0.9.13 ([#13329](https://github.com/opensearch-project/OpenSearch/pull/13329), [#13559](https://github.com/opensearch-project/OpenSearch/pull/13559))