Core: add max_determinized_states to query_string and regexp query/filter

This prevents too-difficult regular expressions from consuming
excessive RAM/CPU; the default max_determinized_states is 10,000 (same
as Lucene) but query_string and regepx query/filter can override
per-request.

The also upgrades to a new Lucene 5.0.0 snapshot.

Closes #8386

Closes #8357