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Client modifies configuration object such that it cannot be used again

See original GitHub issue

When passing a config object to new elasticsearch.Client(), the Client modifies the passed in config object in such a way that it cannot be used to create a second client.

Example:

var elasticsearch = require('elasticsearch');

var config = {
    log : "warning"
};

console.dir(config);
var es1 = new elasticsearch.Client(config);
console.dir(config);
var es2 = new elasticsearch.Client(config);

> node es-config-bug.js 
{ log: 'warning' }
{ log: 
   { _events: 
      { closing: [Object],
        error: [Function: bound],
        warning: [Function: bound] } },
  host: 'http://localhost:9200',
  hosts: 'http://localhost:9200',
  maxSockets: 10,
  maxKeepAliveRequests: 0,
  maxKeepAliveTime: 300000 }

/Users/jvonnieda/Desktop/test/node_modules/elasticsearch/src/lib/log.js:44
      throw new TypeError('Invalid logging output config. Expected either a lo
            ^
TypeError: Invalid logging output config. Expected either a log level, array of log levels, a logger config object, or an array of logger config objects.
    at new Log (/Users/jvonnieda/Desktop/test/node_modules/elasticsearch/src/lib/log.js:44:13)
    at new Transport (/Users/jvonnieda/Desktop/test/node_modules/elasticsearch/src/lib/transport.js:17:27)
    at Object.EsApiClient (/Users/jvonnieda/Desktop/test/node_modules/elasticsearch/src/lib/client.js:49:22)
    at new Client (/Users/jvonnieda/Desktop/test/node_modules/elasticsearch/src/lib/client.js:60:10)
    at Object.<anonymous> (/Users/jvonnieda/Desktop/test/es-config-bug.js:10:11)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)