Fix cross-cluster IT failure

Signed-off-by: Aaron Alvarez <aaarone@amazon.com>

Author: aaarone90

integ-test/src/test/java/org/opensearch/sql/security/CrossClusterSearchIT.java

@@ -290,21 +290,29 @@ public void testCrossClusterAppend() throws IOException {
 
   @Test
   public void testCrossClusterConvert() throws IOException {
+    enableCalcite();
+
     JSONObject result =
         executeQuery(
             String.format(
                 "search source=%s | convert auto(balance) | fields balance",
                 TEST_INDEX_BANK_REMOTE));
     verifyColumn(result, columnName("balance"));
+
+    disableCalcite();
   }
 
   @Test
   public void testCrossClusterConvertWithAlias() throws IOException {
+    enableCalcite();
+
     JSONObject result =
         executeQuery(
             String.format(
                 "search source=%s | convert auto(balance) AS balance_num | fields balance_num",
                 TEST_INDEX_BANK_REMOTE));
     verifyColumn(result, columnName("balance_num"));
+
+    disableCalcite();
   }
 }