fix ut

Signed-off-by: Yupeng Fu <[email protected]>

Author: yupeng9

server/src/test/java/org/opensearch/index/engine/IngestionEngineTests.java

@@ -132,7 +132,7 @@ public void testRecovery() throws IOException {
 
     public void testPushAPIFailures() {
         assertThrows(IngestionEngineException.class, () -> ingestionEngine.index(Mockito.any(Engine.Index.class)));
-        assertThrows(IngestionEngineException.class, () -> ingestionEngine.delete(Mockito.any(Engine.Index.class)));
+        assertThrows(IngestionEngineException.class, () -> ingestionEngine.delete(Mockito.any(Engine.Delete.class)));
     }
 
     public void testCreationFailure() throws IOException {