Field.keyword empty in Discover

Hello All,

In Discover, i see all my value do i need.

sysvalval 2

When i add a filter like sysvalval.keyword the list of value is empty.

I use
Kibana version v7.10

Many thanks in advance

Hello,

My length field is 1280.

In my template i have this:

'ignore_above: 256'

My template is autogenerated with logtash.

How can i change to 1280?

Many thanks in advance

Herve