Simplify test

Signed-off-by: Lorenzo Stella <stellalo@amazon.de>

Author: lostella

api/src/test/java/org/opensearch/sql/api/UnifiedQueryPlannerTest.java

@@ -7,7 +7,6 @@
 
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThrows;
-import static org.mockito.Mockito.when;
 
 import java.util.List;
 import java.util.Map;
@@ -202,18 +201,13 @@ public void testPlanPropagatingSyntaxCheckException() {
 
   @Test
   public void testJoinQuery() {
-    when(testSettings.getSettingValue(Settings.Key.CALCITE_SUPPORT_ALL_JOIN_TYPES))
-      .thenReturn(true);
-
     UnifiedQueryPlanner planner = UnifiedQueryPlanner.builder()
       .language(QueryType.PPL)
       .catalog("opensearch", testSchema)
       .defaultNamespace("opensearch")
       .settings(testSettings)
       .build();
 
-    planner.plan(
-      "source = index | join on index.id = index2.id index2"
-    );
+    planner.plan("source = index | join on index.id = index2.id index2");
   }
 }