Added tests for wildcard KEEP

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/session/IndexResolverFieldNamesTests.java

@@ -1384,6 +1384,19 @@ public void testLookupJoinKeep() {
         );
     }
 
+    public void testLookupJoinKeepWildcard() {
+        assertFieldNames(
+            """
+                FROM employees
+                | KEEP languages
+                | RENAME languages AS language_code
+                | LOOKUP JOIN languages_lookup ON language_code
+                | KEEP language*""",
+            Set.of("language*", "languages", "languages.*", "language_code", "language_code.*"),
+            Set.of()  // Since we have KEEP after the LOOKUP, we can use the global field names instead of wildcarding the lookup index
+        );
+    }
+
     public void testMultiLookupJoin() {
         assertFieldNames(
             """
@@ -1459,6 +1472,19 @@ public void testMultiLookupJoinKeepAfter() {
         );
     }
 
+    public void testMultiLookupJoinKeepAfterWildcard() {
+        assertFieldNames(
+            """
+                FROM sample_data
+                | EVAL client_ip = client_ip::keyword
+                | LOOKUP JOIN clientips_lookup ON client_ip
+                | LOOKUP JOIN message_types_lookup ON message
+                | KEEP *env*, *type*""",
+            Set.of("*env*", "*type*", "client_ip", "message", "client_ip.*", "message.*"),
+            Set.of()  // Since the KEEP is after both JOINs, we can use the global field names
+        );
+    }
+
     public void testMultiLookupJoinSameIndex() {
         assertFieldNames(
             """