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Rodrigo ZhouandVladyslav Simonenko cdeaf1949f Set the "missing" key in ES sorter (#8964)
## What changed?
Explicitly set the `"missing"` key in ES sorter. This is to address
pagination bug in OpenSearch 2.8.0+ (see
https://github.com/opensearch-project/OpenSearch/issues/8212#issuecomment-1615325095).

Run CI tests with latest version of OpenSearch 2 and OpenSearch 3.

## Why?
Full support of OpenSearch as visibility store.

## How did you test it?
- [ ] built
- [ ] run locally and tested manually
- [x] covered by existing tests
- [ ] added new unit test(s)
- [ ] added new functional test(s)

## Potential risks
2026-01-26 16:57:06 -08:00
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