ESQL: Add more LOOKUP JOIN cases to EsqlSecurityIT (#120477)

Author: alex-spies

x-pack/plugin/esql/qa/security/src/javaRestTest/java/org/elasticsearch/xpack/esql/EsqlSecurityIT.java

@@ -597,6 +597,16 @@ public void testLookupJoinIndexForbidden() throws Exception {
         assertThat(resp.getMessage(), containsString("Unknown index [lookup-user1]"));
         assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
 
+        resp = expectThrows(
+            ResponseException.class,
+            () -> runESQLCommand(
+                "metadata1_read2",
+                "FROM lookup-user2 | EVAL value = 10.0 | LOOKUP JOIN `lookup-first-alias` ON value | KEEP x"
+            )
+        );
+        assertThat(resp.getMessage(), containsString("Unknown index [lookup-first-alias]"));
+        assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
+
         resp = expectThrows(
             ResponseException.class,
             () -> runESQLCommand("metadata1_read2", "ROW x = 10.0 | EVAL value = x | LOOKUP JOIN `lookup-user1` ON value | KEEP x")
@@ -612,6 +622,20 @@ public void testLookupJoinIndexForbidden() throws Exception {
         assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
     }
 
+    public void testFromLookupIndexForbidden() throws Exception {
+        var resp = expectThrows(ResponseException.class, () -> runESQLCommand("metadata1_read2", "FROM lookup-user1"));
+        assertThat(resp.getMessage(), containsString("Unknown index [lookup-user1]"));
+        assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
+
+        resp = expectThrows(ResponseException.class, () -> runESQLCommand("metadata1_read2", "FROM lookup-first-alias"));
+        assertThat(resp.getMessage(), containsString("Unknown index [lookup-first-alias]"));
+        assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
+
+        resp = expectThrows(ResponseException.class, () -> runESQLCommand("alias_user1", "FROM lookup-user1"));
+        assertThat(resp.getMessage(), containsString("Unknown index [lookup-user1]"));
+        assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
+    }
+
     private void createEnrichPolicy() throws Exception {
         createIndex("songs", Settings.EMPTY, """
             "properties":{"song_id": {"type": "keyword"}, "title": {"type": "keyword"}, "artist": {"type": "keyword"} }