add "affected dashboards" to Visualization save dialogue

[djschny]

Visualizations can be used in many dashboards. When updating (re-saving) a visualization it would be helpful to know what Dashboards will be affected. This is especially handy for users with very large amounts of Dashboards and saved Visualizations.

This is a request to consider an enhancement to include the list of dashboards that will be affected when a Visualization is re-saved/updated. The following Sense/Console query is what I use currently to find this information out:

GET /.kibana/dashboard/_search?_source_include=title
{
  "query": {
    "match": {
      "panelsJSON": "vis_name"
    }
  }
}

I suggest the save dialogue area for the following reasons:

• It provides the information in your face right when it is needed the most: when saving to a visualization name that already exists
• It a modal/dialogue/area of the UI that temporarily appears when clicking the floppy disk icon and therefore there is lots of space available to place this information and it hopefully does not cause a discussion around screen clutter and where to place information on other main views that are already pretty busy

Below is a screenshot of the area I'm referring to as a proposed place to have the list of affected dashboards.

Similar is sort of similar to #2096 but felt different enough in the proposed approach to warrant its own issue.

[elasticmachine]

Pinging @elastic/appex-sharedux (Team:SharedUX)

[stratoula]

cc @elastic/appex-sharedux, I think this is something we would like to have on the content management system. Especially when a user is trying to delete a SO which is references by others.

[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.