Hybrid search for RAG
Anticipate failure modes
Name failures by their mechanism in hybrid search on the technical support search assistant, not with a generic hallucination label.
1Learn the idea
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Response design
For each severe hybrid search failure on the technical support search assistant, define stop condition, safe state, owner, and lasting prevention. Rollback only works if prior prompts, indexes, and models remain available. “Send to a human” needs queue capacity and context—not just a button name.
Run one tabletop on the technical support search assistant for hybrid search: inject a defect, verify detection, contain, recover, and keep the blameless trace.
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Make it operational
After the tabletop, store the injected hybrid search defect for the technical support search assistant as a regression fixture. If the same failure later reaches users silently, your detection story was aspirational. Detection without a fixture tends to rot for hybrid search.
Also pin one numeric memory from this hybrid search chapter: On 50 tickets, pure vector recall@5=0.72, pure BM25=0.64, RRF hybrid=0.86—report denominators. That number is not decoration; it is a template for how claims about hybrid search on the technical support search assistant should look in design docs. Scoped specifically to hybrid search / technical support search assistant / failure-modes.
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Common mix-ups
People confuse hybrid search with neighboring buzzwords when debugging the technical support search assistant. Before changing prompts, ask whether the broken stage was evidence gathering, the hybrid search judgment itself, validation, or the product action. Fixing the wrong stage creates folklore (“we tried hybrid search and it failed”) that blocks the next team on the technical support search assistant. Scoped specifically to hybrid search / technical support search assistant / failure-modes.
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Rehearsal (hybrid-search-rag/failure-modes)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to hybrid search rag rather than generic AI advice.
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Rehearsal (hybrid-search-rag/failure-modes)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to hybrid search rag rather than generic AI advice.
Read
Rehearsal (hybrid-search-rag/failure-modes)
Write a five-line artifact for this page: goal, inputs, check, owner, stop rule. Invent one fluent failure that the check would catch. Keep details specific to hybrid search rag rather than generic AI advice.
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Before you start
Why this matters
Invent an incident for the technical support search assistant involving hybrid search. What earliest signal should fire before users complain?
ID miss
Detect with error code only in lexical index. Respond by ensure analyzers keep codes.
Fusion drowning
Detect with one channel dominates scores. Respond by calibrate on labeled set.
Filter mismatch
Detect with ACL applied on one channel only. Respond by enforce filters uniformly.
Reranker latency spike
Detect with p95 blows SLO. Respond by cap candidates; async path.
In the wild
See how this idea shows up as a product and a company — then come back to the lesson. Skills transfer across vendors.
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