The "lowercase" tokenizer doesn't apply lowercasing to multi-term queries

[nik9000]

While working on #24751 I wrote a test for the behavior that the lowercase tokenizer has with regards to multi-term queries. It looks like it is supposed to lowercase them. But it doesn't seem to work because nothing I can see checks whether or not the tokenizer is a MultiTermAwareComponent.

I think this is a bug. @jpountz, what do you think?

[jpountz]

Agreed!

[romseygeek]

This is the same bug as #28894, which in turn is caused by https://issues.apache.org/jira/browse/LUCENE-8186