Assert the message in test

Author: pawankartik-elastic

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/parser/StatementParserTests.java

@@ -3232,7 +3232,12 @@ public void testInvalidPatternsWithIntermittentQuotes() {
             // Construct the new invalid index pattern.
             var remoteIndexWithInvalidChar = quote(randomIdentifier() + ":" + "foo" + randomInvalidChar + "bar");
             var query = "FROM " + randomIndex + "," + remoteIndexWithInvalidChar;
-            expectError(query, "must not contain the following characters [' ','\"',',','/','<','>','?','\\','|']");
+            expectError(
+                query,
+                "Invalid index name [foo"
+                    + randomInvalidChar
+                    + "bar], must not contain the following characters [' ','\"',',','/','<','>','?','\\','|']"
+            );
         }
 
         // Colon outside a quoted string should result in an ANTLR error: a comma is expected.