Why I cannot delete Message field in ES 1.7.1?

Hi Experts,

I am on ES1.7.1 when I am deleting message field , kibana shows nothing in Discover page , however if I do the same in ES2.x things are working smoothly .

Can someone suggest what could be the reason for this , or any alternate to delete message field in ES 1.7.1 as it is consuming lot of space .

Thanks
VG

Ah!! I got this , my "_all" was not enabled , I turned it on now things are working smoothly even after deleting Message field .

Remember in ES1.7.1
If you want to delete message field then make sure _all should be enabled (check this).Hope this will help someone .

Thanks
VG