Summary

• Scroll context leak fix: Extract scroll_id from the initial response before entering the loop in scroll_hits, ensuring ES scroll contexts are always cleared even if the yield block raises on the first iteration
• Break Response → Query circular reference: Response now stores query_definition (a Hash) instead of the full Query object, allowing the GC to collect responses and their associated raw response hashes independently
• Make Query#reset! public: Apps can now explicitly clear cached @response on reused Query objects to release memory
• Lightweight event payloads: Event instrumentation now stores query_definition instead of the full Query object reference, preventing accidental retention via subscriber payloads