title: How to add default @timestamp to my elastic search data
body: <p>I am trying to populate dashboard in kibana with Elasticsearch data on date fields .
  I have log file with dates and i find that i don't  have <code>@timestamp</code> in it.</p>
  
  <p>Here is mapping :</p>
  
  <pre><code>PUT test2
  {
    "settings": {
      "index.mapping.ignore_malformed": true 
    },
    "mappings": {
      "my_type": {
        "properties": {
      "Size": {"type": "integer","ignore_malformed": true },
      "Copy Size": {"type": "integer","ignore_malformed": true }
      "Email Sent Time": {"type": "date"},
      "Creation Time": {"type": "date"},
      "Modification Time": {"type": "date"}
        }
      }
    }
  }
  </code></pre>
  
  <p>How to add default timestamp? To create area chart in kibana.</p>