I received an error when I delete an index from elasticsearch - node.js

Question

I received an error when I manually deleted an index from elasticsearch. This happen after manually deleted and I use User.search function in the route. This is the error:
Error: [search_phase_execution_exception] all shards failed
The reason why I manually deleted the index is because mongoosastic has a known issue where, whenever I delete documents from mongodb, elasticsearch still has the documents with it.
Here's the code
models/user.js
var mongoose = require('mongoose');
var mongoosastic = require('mongoosastic');
var Schema = mongoose.Schema;
var UserSchema = new Schema({
private: false,
twitter: String,
tokens: Array,
username: String,
displayName: String,
picture: String,
});
UserSchema.plugin(mongoosastic, {
hosts: [
'localhost:9200'
]});
module.exports = mongoose.model('User', UserSchema);
router.js
User.createMapping(function(err, mapping) {
if (err) {
console.log('error creating mapping (you can safely ignore this)');
console.log(err);
} else {
console.log('mapping created!');
console.log(mapping);
}
});
var stream = User.synchronize();
var count = 0;
stream.on('data', function(err, doc){
count++;
});
stream.on('close', function(){
console.log('indexed ' + count + ' documents!');
});
stream.on('error', function(err){
console.log(err);
});
/* The result for searching for User's */
router.get('/search', function(req, res, next) {
console.log(req.query.q);
if (req.query.q) {
User.search({
query_string:
{ query: req.query.q }
}, function(err, results) {
if (err) return next(err);
console.log(results);
var data = results.hits.hits.map(function(hit) {
return hit;
});
console.log(data);
return res.render('main/search_results', { data: data });
});
}
});