Add missing getters required to reconstruct FunctionScoreQuery (#137656)

Co-authored-by: Benjamin Trent <ben.w.trent@gmail.com>
Co-authored-by: Panagiotis Bailis <pmpailis@gmail.com>

Author: 3 people

server/src/main/java/org/elasticsearch/common/lucene/search/function/FunctionScoreQuery.java

@@ -197,6 +197,14 @@ public CombineFunction getCombineFunction() {
         return combineFunction;
     }
 
+    public ScoreMode getScoreMode() {
+        return scoreMode;
+    }
+
+    public Float getMaxBoost() {
+        return maxBoost;
+    }
+
     @Override
     public void visit(QueryVisitor visitor) {
         // Highlighters must visit the child query to extract terms