[ES|QL] Fix column info bug in Async Rest Test

muted-tests.yml

@@ -432,9 +432,6 @@ tests:
 - class: org.elasticsearch.xpack.esql.qa.single_node.GenerativeIT
   method: test
   issue: https://github.com/elastic/elasticsearch/issues/127536
-- class: org.elasticsearch.xpack.esql.qa.mixed.MixedClusterEsqlSpecIT
-  method: test {union_types.MultiIndexSortIpStringEval ASYNC}
-  issue: https://github.com/elastic/elasticsearch/issues/127537
 - class: org.elasticsearch.xpack.inference.action.filter.ShardBulkInferenceActionFilterIT
   method: testRestart {p0=false p1=false}
   issue: https://github.com/elastic/elasticsearch/issues/127592

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

@@ -1289,6 +1289,7 @@ public static Map<String, Object> runEsqlAsync(
         String id = (String) json.get("id");
 
         var supportsAsyncHeaders = clusterHasCapability("POST", "/_query", List.of(), List.of("async_query_status_headers")).orElse(false);
+        var supportsSuggestedCast = clusterHasCapability("POST", "/_query", List.of(), List.of("suggested_cast")).orElse(false);
 
         if (id == null) {
             // no id returned from an async call, must have completed immediately and without keep_on_completion
@@ -1334,7 +1335,14 @@ public static Map<String, Object> runEsqlAsync(
 
         // assert initial contents, if any, are the same as async get contents
         if (initialColumns != null) {
-            assertEquals(initialColumns, result.get("columns"));
+            if (supportsSuggestedCast == false) {
+                assertEquals(
+                    removeOriginalTypesAndSuggestedCast(initialColumns),
+                    removeOriginalTypesAndSuggestedCast(result.get("columns"))
+                );
+            } else {
+                assertEquals(initialColumns, result.get("columns"));
+            }
             assertEquals(initialValues, result.get("values"));
         }
 
@@ -1343,6 +1351,25 @@ public static Map<String, Object> runEsqlAsync(
         return removeAsyncProperties(result);
     }
 
+    private static Object removeOriginalTypesAndSuggestedCast(Object response) {
+        if (response instanceof ArrayList<?> columns) {
+            var newColumns = new ArrayList<>();
+            for (var column : columns) {
+                if (column instanceof Map<?, ?> columnMap) {
+                    var newMap = new HashMap<>(columnMap);
+                    newMap.remove("original_types");
+                    newMap.remove("suggested_cast");
+                    newColumns.add(newMap);
+                } else {
+                    newColumns.add(column);
+                }
+            }
+            return newColumns;
+        } else {
+            return response;
+        }
+    }
+
     public void testAsyncGetWithoutContentType() throws IOException {
         int count = randomIntBetween(0, 100);
         bulkLoadTestData(count);