Fix test regressions.

Author: afoucret

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/inference/InferenceOperatorTestCase.java

@@ -40,6 +40,7 @@
 import org.junit.After;
 import org.junit.Before;
 
+import java.util.HashSet;
 import java.util.function.BiFunction;
 import java.util.function.Consumer;
 
@@ -146,7 +147,8 @@ private void runWithRandomDelay(Runnable runnable) {
         };
 
         ClusterService clusterService = mock(ClusterService.class);
-        when(clusterService.getClusterSettings()).thenReturn(mock(ClusterSettings.class));
+        ClusterSettings clusterSettings = new ClusterSettings(Settings.EMPTY, new HashSet<>(InferenceSettings.getSettings()));
+        when(clusterService.getClusterSettings()).thenReturn(clusterSettings);
         when(clusterService.getSettings()).thenReturn(Settings.EMPTY);
 
         return new InferenceService(mockClient, clusterService);