how to set fielddata=true in kibana

Question

I am new to Kibana, have data loaded into Elastic 5.0.0-alpha3 and am using Kibana 5.0.0-alpha3 to Visualise. I can display some numeric fields as histograms but when I want

Answer 1

Enable fielddata on an existing text field, this is required to do aggregation on this field

PUT megacorp/_mapping/employee
{
  "properties": {
    "interests": { 
      "type":     "text",
      "fielddata": true
    }
  }
}