remove XXX note

lib/workers/index.js

@@ -135,8 +135,6 @@ Workers.initializeIndexWorkers = function (Env, config, _cb) {
 
         var state = workers[workerIndex];
 
-        // XXX insert a queue here to prevent timeouts
-
         const txid = guid();
         msg.txid = txid;
         msg.pid = PID;