[Approximation Framework] Extend approximation to top-level term queries on numeric fields

[harshavamsi]

Is your feature request related to a problem? Please describe

Numeric fields like long, int, etc use lucene's newExactQuery which return a newRangeQuery which is internally a PointRangeQuery. With ApproximatePointRangeQuery we should be able to wrap top level term queries against these mappers. I think it is fairly common for users today to search for a single term indexed as a number and it should help speed up the results

Describe the solution you'd like

Wrap existing field mapper term queries for number fields with ApproximatePointRangeQuery. canApproximate will receive SearchContext and will kick in approximation when appropriate

Related component

Search:Performance

Describe alternatives you've considered

No response

Additional context

No response

[sawansri]

Hey, can I tackle this issue?

[sawansri]

Hey @harshavamsi , I'd love to hear your thoughts on implementing ApproximateTermQuery which would use canApproximate to determine whether a term query can be approximated or not (only on numeric fields). I'm not sure if we can naively replace newExactQuery with ApproximatePointRangeQuery since we currently can't approximate term queries that are clauses in boolean queries. canApproximate in ApproximateTermQuery would check whether the term query is a clause in a boolean query and return false if it is.