title: Elasticsearch change date format when mapping
body: <p>I am using Laravel with Elasticsearch. But I cant map my mysql timestamps since ES by default only support timestamp as ISO 8601 "2015-02-02T15:30:20"</p>
  
  <p>And I want to map my timestamps that looks like "2015-02-15 15:30:22" -a TS without the "T"</p>
  
  <p>Is it possible to change ES so it allows timestamps like "2015-02-15 15:30:22"?</p>