Update CHANGELOG.md

Signed-off-by: Isaac Johnson <[email protected]>
opensearch-project · Aug 28, 2024 · 632f2e0 · 632f2e0
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@@ -15,6 +15,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased 2.x](https://github.com/opensearch-project/neural-search/compare/2.16...2.x)
 ### Features
+- Implement Reciprocal Rank Fusion document score normalization/combination technique in hybrid query ([#874](https://github.com/opensearch-project/neural-search/pull/874))
 ### Enhancements
 ### Bug Fixes
 ### Infrastructure