Scripted Fields Lack Validation

[panda01]

When creating a scripted field, if you use a field that isn't a numeral, when you go to discover Kibana just kind of barfs on itself.

Since we can get the field types from ES, i think we should use those to help the user along with making them.

Also, When you input a non valid value into the formatters, no error is thrown, or anything indicating that that value, will not work.

This probably will need to be broken down, into two actionable tasks.

Repro

• Creating a field that uses doc['cluster.state.status'].value
• Go to Discover
• That field is the only field in the sidebar, and Discover does not load

[panda01]

Discovered while messing with #4594.

[panda01]

[w33ble]

Labeling low fruit because I think we can simply use the scripted field and see if we get an error from Elasticsearch when we try, but it may be more complicated than that.

[nreese]

closed by #20746