DateTime Field doesn't appear in search index

Topics: Customizing Orchard, General, Writing modules
Feb 4 at 8:16 AM
I have created one content part say News which is attachable, having one property of type DateTime
I have attached this content part to one content type.
in content type I have set "Include in index" for my DateTime field of content part.

now i have created one index say NewsIndex.
Set this newsIndex in content type (Published Version)

Rebuild index.
now when i go to Settings->Search, I am not able to see my DateTime field check box over there.

I am using Orchard version : 1.10.1.0

I have tried above situation by both way.. (From admin dashboard and using Code)

Facing this issue since 5 day, trying a lot but not able to get success. Really needed help on this.