public Result pauseMessageProcessing() {
try {
Http.RequestBody body = request().body();
final String nodeId = body.asFormUrlEncoded().get("node_id")[0];
final Node node = nodeService.loadNode(nodeId);
node.pause();
return ok();
} catch (IOException e) {
return internalServerError("io exception");
} catch (APIException e) {
return internalServerError("api exception " + e);