CSV upload - allow not_analyzed option for strings

[markwalkom]

It'd be awesome if we could have an option when defining the mappings for an uploaded CSV so that the user could pick a not_analyzed string.

It'd be even awesomer if that was in the drop down, something like string - not_analyzed;

[markwalkom]

Ok, I can see we create a $FIELD.keyword value by default, which I missed before.
It'd be good to still have an option to only have the non analysed value from scratch.

[markwalkom]

It'd also be good if we could drop/ignore fields.
Should I update the title to make it a little more inclusive, or raise different issues?

[Bargs]

There's an existing ticket for the ability to remove columns: #7735

Dropping/ignoring fields is something we'll be able to do with ingest pipelines, but customizing the mappings we'll need to do in the existing wizard, so it makes sense to keep the issues separate.

[epixa]

I'm going to close this since CSV upload was pulled. We can always refer back to this issue if/when we revisit the feature.