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
public void testKeywordFieldExecutionContext() throws IOException {
        ScriptService scriptService = getInstanceFromNode(ScriptService.class);
        IndexService indexService = createIndex("index", Settings.EMPTY, "doc", "rank", "type=long", "text", "type=keyword");
        Request.ContextSetup contextSetup = new Request.ContextSetup("index", new BytesArray("""
            {"rank": 4.0, "text": "quick brown fox"}"""), new MatchQueryBuilder("text", "fox"));
        contextSetup.setXContentType(XContentType.JSON);
        contextSetup.setXContentType(XContentType.JSON);
        Request request = new Request(
            new Script(ScriptType.INLINE, "painless", "emit(doc['rank'].value + doc['text'].value)", emptyMap()),
            "keyword_field",
            contextSetup
        );
        Response response = innerShardOperation(request, scriptService, indexService);
        assertEquals(Collections.singletonList("4quick brown fox"), response.getResult());
        contextSetup = new Request.ContextSetup("index", new BytesArray("{}"), new MatchAllQueryBuilder());
        contextSetup.setXContentType(XContentType.JSON);
        request = new Request(
            new Script(
                ScriptType.INLINE,
                "painless",
                "emit(\"test\"); emit(\"baz was not here\"); emit(\"Data\"); emit(\"-10\"); emit(\"20\"); emit(\"9\");",
                emptyMap()
            ),
            "keyword_field",
            contextSetup
        );
        response = innerShardOperation(request, scriptService, indexService);
        assertEquals(Arrays.asList("test", "baz was not here", "Data", "-10", "20", "9"), response.getResult());
    }
    public void testCompositeExecutionContext() throws IOException {