[Feature Request] Move ApproximatePointRangeQuery out of feature flag

[harshavamsi]

Is your feature request related to a problem? Please describe

In 2.17 we introduced ApproximatePointRangeQuery, a range query on timestamp fields that would short circuit after collecting the required number of this. This was gated behind a feature flag, we should mark it for GA in 2.18. We will also allow other field types to take advantage of this optimization in #14406.

Describe the solution you'd like

See request

Related component

Search:Performance

Describe alternatives you've considered

No response

Additional context

No response

[msfroh]

[Search Triage] @harshavamsi, can you please document what steps you plan to take (benchmarks? tests?) to validate that the feature is ready for GA? Thanks!