Allow for expanding and collapsing all/multiple fields

[cjcenizal]

Per feedback from @fxdgear, it would be useful to be able to expand and collapse multiple fields, especially in the case of a deeply nested mappings object with many fields. Examples of behavior:

1. A button that collapses/expands all fields.
2. Command-clicking or shift-clicking a field to auto-expand/collapse all of its children.

[elasticmachine]

Pinging @elastic/es-ui (Team:Elasticsearch UI)

[felix-lessoer]

I also have customers asking about that. This is the behavior of data doc in their "logs" view. Would be nice having something similar in Discover and other apps that show raw field data in Kibana.

Here is an example:

@shaunmcgough Could you take care of that? Or provide feedback?
@timroes What do you think about that?

[timroes]

@felix-lessoer We had expanding/collapsing in discover for a very long time, and it seems it got lost when switching away from Angular to EUI. I opened #59949 to track the request.

[sebelga]

I just want to add that this is possibly something that can make the browser freeze or be very unresponsive. Imagine expanding all the fields of the mappings of this index template:

https://gist.github.com/cjcenizal/09837195a7b1f2ba1447aa4d67859497

We want to protect the user from doing that.

It would be interesting to understand the pain point of the user and think if we could solve it by improving the search field experience.

[felix-lessoer]

The customer has different categories of fields. Like we also have in ECS. They want to quickly navigate through the different fields and hiding information they don't need.

Their biggest point was that they do this in Datadog and that they really like that experience. So they stay with Datadog at the moment.