Reciprocal Rank Fusion (RRF) normalization technique in hybrid query (o…

…pensearch-project#874)

* initial commit of RRF

Signed-off-by: Isaac Johnson <isaacnj@amazon.com>

Co-authored-by: Varun Jain <varunudr@amazon.com>
Signed-off-by: Martin Gaievski <gaievski@amazon.com>

.github/workflows/CI.yml

@@ -163,3 +163,4 @@ jobs:
       - name: Run build
         run: |
           ./gradlew precommit --parallel
+