Error: connect EADDRNOTAVAIL - maxsockets being ignored? about arangojs HOT 4 CLOSED

var moment = require('moment');

var db = require('arangojs')({
    url: 'http://localhost:8000',
    agentOptions: {maxSockets: 5},
    databaseName: 'loadtest'
});

var recs = 1000000,
    startDoc = 10122492 + 1,
    currentDoc = 0,
    type,
    start = new Date(),
    collection;

function save() {
    type = Math.round(Math.random() * 10) + 1;
    collection
        .save({
            'id': startDoc + currentDoc,
            'type': type,
            'connections': [
                Math.round(Math.random() * 100) + 1,
                Math.round(Math.random() * 100) + 1,
                Math.round(Math.random() * 100) + 1,
                Math.round(Math.random() * 100) + 1
            ],
            'positions': [
                {
                    'time': new Date(),
                    'type': type,
                    'position': {'lat': -122.423246, 'lng': 37.779388, 'radius': 250}
                }
            ]
        },
        function (err, result) {
            if (err || result.error) {
                return console.error(err);
            }
            console.log('inserted ' + currentDoc + ' of ' + recs);
            if (currentDoc === recs) {
                return console.log('inserted ' + currentDoc + ' in ' + moment.utc(moment(new Date(), "DD/MM/YYYY HH:mm:ss").diff(moment(start, "DD/MM/YYYY HH:mm:ss"))).format("HH:mm:ss"));
            }
            currentDoc++;
            save();
        });
}

db.collection('load', function (err, result) {
    if (err) {
        console.error(err);
        return;
    }
    collection = result;
    console.info('starting: ' + start);
    save();
});

{ [Error: connect ETIMEDOUT]
  code: 'ETIMEDOUT',
  errno: 'ETIMEDOUT',
  syscall: 'connect',
  request: 
   { domain: null,
     _events: { response: [Object], error: [Function] },
     _maxListeners: 10,
     output: [],
     outputEncodings: [],
     writable: true,
     _last: false,
     chunkedEncoding: false,
     shouldKeepAlive: true,
     useChunkedEncodingByDefault: true,
     sendDate: false,
     _headerSent: true,
     _header: 'POST /_db/loadtest/_api/document/?collection=load HTTP/1.1\r\ncontent-type: application/json\r\ncontent-length: 170\r\nx-arango-version: 20300\r\nHost: localhost:8000\r\nConnection: keep-alive\r\n\r\n',
     _hasBody: true,
     _trailer: '',
     finished: true,
     _hangupClose: false,
     socket: 
      { _connecting: false,
        _handle: null,
        _readableState: [Object],
        readable: false,
        domain: null,
        _events: [Object],
        _maxListeners: 10,
        _writableState: [Object],
        writable: false,
        allowHalfOpen: false,
        onend: [Function: socketOnEnd],
        destroyed: true,
        bytesRead: 0,
        _bytesDispatched: 0,
        _pendingData: 'POST /_db/loadtest/_api/document/?collection=load HTTP/1.1\r\ncontent-type: application/json\r\ncontent-length: 170\r\nx-arango-version: 20300\r\nHost: localhost:8000\r\nConnection: keep-alive\r\n\r\n{"id":10136661,"type":6,"connections":[11,38,2,42],"positions":[{"time":"2015-06-21T15:33:36.022Z","type":6,"position":{"lat":-122.423246,"lng":37.779388,"radius":250}}]}',
        _pendingEncoding: 'utf8',
        parser: [Object],
        _httpMessage: [Circular],
        ondata: [Function: socketOnData],
        _idleNext: null,
        _idlePrev: null,
        _idleTimeout: -1 },
     connection: 
      { _connecting: false,
        _handle: null,
        _readableState: [Object],
        readable: false,
        domain: null,
        _events: [Object],
        _maxListeners: 10,
        _writableState: [Object],
        writable: false,
        allowHalfOpen: false,
        onend: [Function: socketOnEnd],
        destroyed: true,
        bytesRead: 0,
        _bytesDispatched: 0,
        _pendingData: 'POST /_db/loadtest/_api/document/?collection=load HTTP/1.1\r\ncontent-type: application/json\r\ncontent-length: 170\r\nx-arango-version: 20300\r\nHost: localhost:8000\r\nConnection: keep-alive\r\n\r\n{"id":10136661,"type":6,"connections":[11,38,2,42],"positions":[{"time":"2015-06-21T15:33:36.022Z","type":6,"position":{"lat":-122.423246,"lng":37.779388,"radius":250}}]}',
        _pendingEncoding: 'utf8',
        parser: [Object],
        _httpMessage: [Circular],
        ondata: [Function: socketOnData],
        _idleNext: null,
        _idlePrev: null,
        _idleTimeout: -1 },
     agent: 
      { domain: null,
        _events: [Object],
        _maxListeners: 10,
        options: [Object],
        requests: {},
        sockets: [Object],
        maxSockets: 5,
        createConnection: [Function] },
     socketPath: undefined,
     method: 'POST',
     path: '/_db/loadtest/_api/document/?collection=load',
     _headers: 
      { 'content-type': 'application/json',
        'content-length': 170,
        'x-arango-version': 20300,
        host: 'localhost:8000' },
     _headerNames: 
      { 'content-type': 'content-type',
        'content-length': 'content-length',
        'x-arango-version': 'x-arango-version',
        host: 'Host' },
     parser: 
      { _headers: [],
        _url: '',
        onHeaders: [Function: parserOnHeaders],
        onHeadersComplete: [Function: parserOnHeadersComplete],
        onBody: [Function: parserOnBody],
        onMessageComplete: [Function: parserOnMessageComplete],
        socket: [Object],
        incoming: null,
        maxHeaderPairs: 2000,
        onIncoming: [Function: parserOnIncomingClient] } } }

Process finished with exit code 0