use jobtype in worker, update query

also simplify the query a bit and use constant_score

src/worker.js

@@ -2,7 +2,7 @@ import events from 'events';
 import Puid from 'puid';
 import moment from 'moment';
 import logger from './helpers/logger';
-import { jobStatuses } from './helpers/constants';
+import constants from './helpers/constants';
 import { WorkerTimeoutError } from './helpers/errors';
 
 const puid = new Puid();
@@ -18,10 +18,11 @@ export default class Job extends events.EventEmitter {
     this.id = puid.generate();
     this.queue = queue;
     this.client = this.queue.client;
-    this.type = type;
+    this.jobtype = type;
     this.workerFn = workerFn;
     this.checkInterval = opts.interval || 1500;
     this.checkSize = opts.size || 10;
+    this.doctype = opts.doctype || constants.DEFAULT_SETTING_DOCTYPE;
 
     this.debug = (...msg) => debug(...msg, `id: ${this.id}`);
 
@@ -50,7 +51,7 @@ export default class Job extends events.EventEmitter {
       attempts: attempts,
       started_at: startTime,
       process_expiration: expirationTime,
-      status: jobStatuses.JOB_STATUS_PROCESSING,
+      status: constants.JOB_STATUS_PROCESSING,
     };
 
     return this.client.update({
@@ -76,7 +77,7 @@ export default class Job extends events.EventEmitter {
 
     const completedTime = moment().toISOString();
     const doc = {
-      status: jobStatuses.JOB_STATUS_FAILED,
+      status: constants.JOB_STATUS_FAILED,
       completed_at: completedTime,
     };
 
@@ -136,7 +137,7 @@ export default class Job extends events.EventEmitter {
       const docOutput = this._formatOutput(output);
 
       const doc = {
-        status: jobStatuses.JOB_STATUS_COMPLETED,
+        status: constants.JOB_STATUS_COMPLETED,
         completed_at: completedTime,
         output: docOutput
       };
@@ -226,20 +227,23 @@ export default class Job extends events.EventEmitter {
 
   _getPendingJobs() {
     const nowTime = moment().toISOString();
-    const dateFilter = {
-      range: {
-        process_expiration: {
-          lte: nowTime
-        }
-      }
-    };
     const query = {
       query: {
-        bool: {
-          should: [
-            { bool: { must: [{ term: { status: 'pending'} }] }},
-            { bool: { must: [{ term: { status: 'processing'}} ], filter: dateFilter } }
-          ]
+        constant_score: {
+          filter: {
+            bool: {
+              must: { term: { jobtype: this.jobtype } },
+              should: [
+                { term: { status: 'pending'} },
+                { bool:
+                  { must: [
+                    { term: { status: 'processing' } },
+                    { range: { process_expiration: { lte: nowTime } } }
+                  ] }
+                }
+              ]
+            }
+          }
         }
       },
       sort: [
@@ -253,7 +257,7 @@ export default class Job extends events.EventEmitter {
 
     return this.client.search({
       index: `${this.queue.index}-*`,
-      type: this.type,
+      type: this.doctype,
       version: true,
       body: query
     })