Controls visualization does show incomplete items

I installed ELK 7.3. When I use a Controls visualization, the dropdown list does not include all items I expected from the specified index pattern. A little warning rectangle shows: Terms is incomplete. Adjust autocomplete setting in kibana.yml for more result. Which setting I should update in kibana.yml? Thanks ahead.

Here it is from the Configuring Kibana docs:

kibana.autocompleteTerminateAfter: Default: "100000" Maximum number of documents loaded by each shard to generate autocomplete suggestions. This value must be a whole number greater than zero.

Thanks. It works.