Index .tasks missing

I am trying to track problematic tasks in Elasticsearch 6.8. And as I understast such tasks should be visable in .tasks index. But it is non existing and I can not find any documentation how to enable it.

_tasks API is an option but it only shows currently running tasks .

What do you mean by problematic tasks here?

Mostly big queries. When users run searches for three months on huge multiple indexes and makes writing to cluster time out. I want to find such queries and figure out what to do about them.

I don't think slow searches are logged in the .tasks index, but you can configure them to appear in the slow log instead.

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