[Search Sessions] Show chart starts a new search session

[lizozom]

1. Go to Discover
2. Save a search session that has some data.
3. Click hide chart
4. Session stays the same
5. Click show chart
6. New session starts

Expected result: session should stay the same

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[flash1293]

I'm not sure whether this is a bug or not - showing the chart actually changes the query (adding a date histogram aggregation)

[timroes]

I agree with Joe. We need to fetch different data for the chart than we need for the documents. We're also about to split those queries completely apart. So I think this is correct behavior since we're switching the queries that should be done. Closing this for now, but please feel to reopen in case I've missunderstood how search sessions should be working in this case.