From the Kibana, I have defined two index patterns; one is for specific logs (e.g. access-gateway-), and another one includes multiple different logs (e.g. access-).
I go the "Discover" tag and select access-gateway-* index to display data. I can see the "Filter for value" icon shown up when the mouse pointer hovers over the column (as shown in the diagram.)
However, when I select access-* index and display the data again, the "Filter for value" icon is no longer available.
Not sure if it is Kibana bug or something I have done.