Similarly to https://github.com/elastic/elasticsearch/pull/97873 but for request handlers: let's stop passing around strings and looking these things up by name on each request when we could just pass around the `Executor` itself.
server/src/main/java/org/elasticsearch/action/support/nodes/TransportNodesAction.java
@Override
        public void messageReceived(NodeRequest request, TransportChannel channel, Task task) throws Exception {
            channel.sendResponse(nodeOperation(request, task));
        }
    }
}