Allow vertices to be positionable

[elasticmachine]

Original comment by @markwalkom:

Another general enhancement in graph would be to allow vertices to be moved around, while retaining the connections.

This allows you to move a specific vertex out, in case it's clustered with a bunch of other ones and can be hard to see.

[elasticmachine]

Original comment by @markharwood:

This may add some user-facing complexity.
Graph tools with reasonably high levels of functionality such as Gephi and Yed wind up have multiple mouse modes to flip between zooming, panning, selection and arrangement type functions. The user has to select the appropriate mouse mode from a toolbar before performing an action.

We'd need to think carefully about how much functionality we want to pack in (e.g adding rubber-band selection of nodes) and how many mouse-modes we'd need or want to suffer.

Another concern with user-defined placement of vertices is how those choices interact with the automated layout algos :

• do we "freeze" user-positioned nodes?
• how do we mark them as frozen?
• how do we "unfreeze"?

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[elasticmachine]

Pinging @elastic/kibana-visualizations @elastic/kibana-visualizations-external (Team:Visualizations)

[timductive]

Closing this because it's not planned to be resolved in the foreseeable future. It will be tracked in our Icebox and will be re-opened if our priorities change. Feel free to re-open if you think it should be melted sooner.