Support for slow execution of expensive queries

[mayya-sharipova]

Description

Consider support for slow execution of expensive queries.

Sometimes there is a need to execute expensive queries even if it may take a lot of time. Examples of these queries could be:

• wildcard, regular expression queries that create huge automata (exceeding 10K determinized states)
• queries that expand to a lot of terms (exceeding bool max_clause_count)

Consider if there queries could be rewritten into other queries that can run slower but use less resources.

Related: support for an optional 'fallback query'

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)