The value in this field is too long and can't be searched or filtered

Hi Team,

I am using ingest pipeline for dissect and i have given a pattern as %{key1} %{key2} which is working fine.
But the i am unable to use the key1 and key2 for dashboard as it a ignore value warning is comming which says the value of this field is too long and can't be searched or filtered.

Can any one suggest how i can make increase the field size.
This only happen when I am using ingest pipeline.