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elasticsearch.js 文件中的代码

function es() {
  throw new Error('Looks like you are expecting the previous "elasticsearch" module. ' +
    'It is now the "es" module. To create a client with this module use ' +
    '`new es.Client(params)`.');
}

es.Client = require('./lib/client');
es.ConnectionPool = require('./lib/connection_pool');
es.Transport = require('./lib/transport');
es.errors = require('./lib/errors');

module.exports = es;

var elasticsearch = require('elasticsearch')
var client = new es.Client({
  host: 'localhost:9200',
  log: 'trace',
})

// Ping the cluster
client.ping({
     requestTimeOut: 30000,
},
function(error){
  if(error) {
      console.log(error)
      console.error("elasticsearch cluster …