Fix IT

Signed-off-by: Lantao Jin <ltjin@amazon.com>

Author: LantaoJin

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

@@ -186,19 +186,19 @@ public void testCrossClusterJoinSyntax1() throws IOException {
           }
           verifyColumn(
               result,
-              columnName("l.account_number"),
-              columnName("l.address"),
-              columnName("l.age"),
-              columnName("l.balance"),
-              columnName("l.birthdate"),
-              columnName("l.city"),
-              columnName("l.email"),
-              columnName("l.employer"),
-              columnName("l.firstname"),
-              columnName("l.gender"),
-              columnName("l.lastname"),
-              columnName("l.male"),
-              columnName("l.state"),
+              columnName("account_number"),
+              columnName("address"),
+              columnName("age"),
+              columnName("balance"),
+              columnName("birthdate"),
+              columnName("city"),
+              columnName("email"),
+              columnName("employer"),
+              columnName("firstname"),
+              columnName("gender"),
+              columnName("lastname"),
+              columnName("male"),
+              columnName("state"),
               columnName("r.account_number"),
               columnName("r.address"),
               columnName("r.age"),