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 testFilterExecutionContext() throws IOException {
        ScriptService scriptService = getInstanceFromNode(ScriptService.class);
        IndexService indexService = createIndex("index", Settings.EMPTY, "doc", "field", "type=long");
        Request.ContextSetup contextSetup = new Request.ContextSetup("index", new BytesArray("{\"field\": 3}"), null);
        contextSetup.setXContentType(XContentType.JSON);
        Request request = new Request(new Script("doc['field'].value >= 3"), "filter", contextSetup);
        Response response = innerShardOperation(request, scriptService, indexService);
        assertThat(response.getResult(), equalTo(true));
        contextSetup = new Request.ContextSetup("index", new BytesArray("{\"field\": 3}"), null);
        contextSetup.setXContentType(XContentType.JSON);
        request = new Request(
            new Script(ScriptType.INLINE, "painless", "doc['field'].value >= params.max", singletonMap("max", 3)),
            "filter",
            contextSetup
        );
        response = innerShardOperation(request, scriptService, indexService);
        assertThat(response.getResult(), equalTo(true));
        contextSetup = new Request.ContextSetup("index", new BytesArray("{\"field\": 2}"), null);
        contextSetup.setXContentType(XContentType.JSON);
        request = new Request(
            new Script(ScriptType.INLINE, "painless", "doc['field'].value >= params.max", singletonMap("max", 3)),
            "filter",
            contextSetup
        );
        response = innerShardOperation(request, scriptService, indexService);
        assertThat(response.getResult(), equalTo(false));
    }
    public void testScoreExecutionContext() throws IOException {
        ScriptService scriptService = getInstanceFromNode(ScriptService.class);