run expiration tasks in a worker instead of the main process

lib/workers/index.js

@@ -290,6 +290,12 @@ Workers.initializeIndexWorkers = function (Env, config, _cb) {
             }, cb);
         };
 
+        Env.runTasks = function (cb) {
+            sendCommand({
+                command: 'RUN_TASKS',
+            }, cb);
+        };
+
         //console.log("index workers ready");
         cb(void 0);
     });