fix failing test

Author: mridula-s109

x-pack/plugin/rank-rrf/src/test/java/org/elasticsearch/xpack/rank/rrf/RRFRetrieverBuilderTests.java

@@ -37,6 +37,7 @@
 import org.elasticsearch.xcontent.json.JsonXContent;
 
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -511,7 +512,12 @@ public void testInferenceFieldWeights() {
 
         assertNotNull("Inner RRFRetrieverBuilder should exist", innerRrf);
         float[] actualWeights = innerRrf.weights();
+        assertEquals("Should have exactly 2 weights", 2, actualWeights.length);
+        
+        // Sort both arrays to ensure deterministic comparison regardless of HashMap iteration order
         float[] expectedWeights = new float[] { 3.0f, 0.5f };
+        Arrays.sort(actualWeights);
+        Arrays.sort(expectedWeights);
         assertArrayEquals(expectedWeights, actualWeights, 0.001f);
     }