fix tests

Author: fang-xing-esql

x-pack/plugin/esql/qa/server/src/main/java/org/elasticsearch/xpack/esql/qa/rest/RestEsqlTestCase.java

@@ -778,21 +778,24 @@ public void testErrorMessageForMissingParams() throws IOException {
             ResponseException.class,
             () -> runEsql(requestObjectBuilder().query("from idx | where x == ?n1").params("[]"))
         );
-        assertThat(EntityUtils.toString(re.getResponse().getEntity()), containsString("line 1:23: Unknown query parameter [n1]"));
+        assertThat(
+            EntityUtils.toString(re.getResponse().getEntity()).replaceAll("\\\\\n\s+\\\\", ""),
+            containsString("line 1:23: Unknown query parameter [n1]")
+        );
 
         re = expectThrows(
             ResponseException.class,
             () -> runEsql(requestObjectBuilder().query("from idx | where x == ?n1 and y == ?n2").params("[{\"n\" : \"v\"}]"))
         );
-        assertThat(EntityUtils.toString(re.getResponse().getEntity()), containsString("""
+        assertThat(EntityUtils.toString(re.getResponse().getEntity()).replaceAll("\\\\\n\s+\\\\", ""), containsString("""
             line 1:23: Unknown query parameter [n1], did you mean [n]?; line 1:36: Unknown query parameter [n2], did you mean [n]?"""));
 
         re = expectThrows(
             ResponseException.class,
             () -> runEsql(requestObjectBuilder().query("from idx | where x == ?n1 and y == ?n2").params("[{\"n1\" : \"v1\"}]"))
         );
         assertThat(
-            EntityUtils.toString(re.getResponse().getEntity()),
+            EntityUtils.toString(re.getResponse().getEntity()).replaceAll("\\\\\n\s+\\\\", ""),
             containsString("line 1:36: Unknown query parameter [n2], did you mean [n1]")
         );
     }