Trying to hit the [execute API](https://www.elastic.co/guide/en/elasticsearch/painless/8.5/painless-execute-api.html) with an index that in available via cross cluster search will fail with an `IllegalArgumentException`: `Cross-cluster calls are not supported in this context but remote indices were requested`

That is because `PainlessExecuteAction`'s [`TransportAction`](https://github.com/elastic/elasticsearch/blob/8.5/modules/lang-painless/src/main/java/org/elasticsearch/painless/action/PainlessExecuteAction.java#L462) is a [`TransportSingleShardAction`](https://github.com/elastic/elasticsearch/blob/8.5/server/src/main/java/org/elasticsearch/action/support/single/shard/TransportSingleShardAction.java#L153) which uses [`IndexNameExpressionResolver.concreteIndices`](https://github.com/elastic/elasticsearch/blob/8.5/server/src/main/java/org/elasticsearch/cluster/metadata/IndexNameExpressionResolver.java#L331), which does not support remote clusters.

What would it take it enable PainlessExecuteAction to support CCS?

Kibana uses the execute api to validate runtime fields on edit, see https://github.com/elastic/kibana/issues/145861
modules/lang-painless/src/test/java/org/elasticsearch/painless/action/PainlessExecuteApiTests.java
IndexService indexService = createIndex("index", Settings.EMPTY, "doc", "rank", "type=long", "text", "type=text");
        Request.ContextSetup contextSetup = new Request.ContextSetup("index", new BytesArray("""
            {"rank": 4.0, "text": "quick brown fox"}"""), new MatchQueryBuilder("text", "fox"));
        contextSetup.setXContentType(XContentType.JSON);
        Request request = new Request(
            new Script(
                ScriptType.INLINE,
                "painless",
                "Math.round((_score + (doc['rank'].value / params.max_rank)) * 100.0) / 100.0",
                singletonMap("max_rank", 5.0)
            ),
            "score",
            contextSetup
        );
        Response response = innerShardOperation(request, scriptService, indexService);
        assertThat(response.getResult(), equalTo(0.93D));
    }
    public void testBooleanFieldExecutionContext() throws IOException {
        ScriptService scriptService = getInstanceFromNode(ScriptService.class);
        IndexService indexService = createIndex("index", Settings.EMPTY, "doc", "rank", "type=long", "text", "type=text");
        Request.ContextSetup contextSetup = new Request.ContextSetup("index", new BytesArray("""
            {"rank": 4.0, "text": "quick brown fox"}"""), new MatchQueryBuilder("text", "fox"));
        contextSetup.setXContentType(XContentType.JSON);
        Request request = new Request(
            new Script(ScriptType.INLINE, "painless", "emit(doc['rank'].value < params.max_rank)", singletonMap("max_rank", 5.0)),
            "boolean_field",
            contextSetup
        );
        Response response = innerShardOperation(request, scriptService, indexService);
        assertEquals(Collections.singletonList(true), response.getResult());