In your case there is no issue it all, the warning is just telling there might be an issue.
To populate this dropdown, Elasticsearch goes through all of your documents to see what terms are possible. When you have a lot of data, this can take quite a while which breaks the intended user experience of filters. This is why this request will time out early and just give you what it found so far, trading off performance and accuracy.
It basically says that it didn't look everywhere and there might be additional items it didn't found. If you know for sure there are no items missing, you can just ignore it.
There are config settings in the kibana.yml file “kibana.autocompleteTimeout” and “kibana.autocompleteTerminateAfter”. You can increase the default values and restart Kibana, then the missing values should show up.
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