OpenSearch Concurrent Segment Search Bug Showcase

This project aims to demonstrate a bug in OpenSearch 2.16 that occurs specifically during a hybrid search when concurrent segment search is enabled. The only workaround I found to bypass this issue with concurrent segment search is to perform a forced merge operation.

The bug is triggered when executing the same search on a random dataset after purging and re-inserting the documents between runs. The test that highlights this issue is OpenSearchRepositoryTest.triggerConcurrentSegmentSearchBug3Docs and OpenSearchRepositoryTest.triggerConcurrentSegmentSearchBugMultipleDocs.

How to run

./gradlew clean build

execute from IDE `OpenSearchRepositoryTest.trigger concurrent segment search bug`

How to make it pass

• Disable search.concurrent_segment_search.enabled in resources/index_config
• Uncomment lines 109-114 in AbstractIntegrationTest

License

Apache License, Version 2.0