_msearch request when showing/hiding labels in visualizations

[JacobBrandt]

Kibana version: 6.5

Describe the bug:
When opening/hiding the labels on a visualization an _msearch request for the visualization occurs. This request doesn't match the time range for the other visualizations on the dashboard so it's now out of sync from the rest of the dashboard. It really doesn't need to make this request in the first place as it already knows all the data it displayed

Steps to reproduce:

• Ingest data on a regular interval (like every 5 minutes)
• Create a visualization with labels and add it to the dashboard
• Show/Hide the labels on the visualization
• Notice that a request was made for this visualization that doesn't match the dashboard request for the other visualizations. Thus making what it displays out of sync from every other visualization on the dashboard.

Expected behavior:
Only request data when the user asks for new data. A common thing to do was to show the labels for the display. It used to make sense before 6.x versions because it would show you what you are currently looking at. But now it requests new data potentially changing our display and the user wondering how did I start with 3 pie slices and end up with 5 just by showing the labels.

Related to: #18668, #27440, #27478

[elasticmachine]

Pinging @elastic/kibana-app

[timroes]

Duplicate of #21480