Fix range and wildcard queries on type-field for single-type indices

[cbuescher]

This comes from a discussion with @jpountz after looking at #31476.
Range and wildcard queries throw an error when run against a _type field for single-type indices in 6.x and most likely also
in master. While _type is deprecated, it might still we worth fixing these for the time being. In the other hand it seems to be a
rare use-case to query the _type field with a range query, so I'd probably discuss this before diving deeper into it.

[elasticmachine]

Pinging @elastic/es-search-aggs

[cbuescher]

Talked about this in the group, while supporting rangequeries on single type indices seems a bit of an esoteric usecase, supporting wildcards seems desirable to do. Unfortunately this seems to be the harder case technically, so there are no clear ideas of how to do this. Marking this as "adoptme" regardless.