How to turn on query features for all Kibana users permanently

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We upgraded to Elastic stack 6.8.1 recently and love the autocomplete feature on Kibana. Is there a way to turn on the "Turn on query features" permanently on all Kibana apps for all users?

Currently, we have to turn it on every time we load a search or dashboard.

Thanks.

I believe this can be changed in the Advanced Settings. Search for search:queryLanguage and change it to Kuery. https://www.elastic.co/guide/en/kibana/6.8/advanced-options.html#advanced-options

I changed it to Kuery but the checkbox "Turn on query features" is still off and Autocomplete doesn't work by default.

In Kibana 6.3, we introduced a number of exciting experimental query language enhancements. These features are now available by default in 7.0.

Does it mean we can't turn it on by default on v6?