Fix cosmosSearch vector field name: query -> vector

[khelanmodi]

Summary

The cosmosSearch operator in Azure DocumentDB's `` aggregation stage takes the query embedding under the vector field, not `query`. The current vector-search examples use `query:` which is invalid syntax — queries built from these examples will fail at runtime (or silently return wrong results, depending on server build).

This is high-impact because skills/vector-search/vector-knn-query.md is the canonical example the agent surfaces for any ""how do I do vector search?"" prompt, so the agent currently generates broken queries by default.

Changes

Three call sites fixed:

File	Before	After
skills/vector-search/vector-knn-query.md (incorrect example)	query: qv	vector: qv
skills/vector-search/vector-knn-query.md (correct example)	query: queryVector	vector: queryVector
skills/full-text-search/fts-hybrid-search.md (vector arm of hybrid)	query: qv	vector: qv

Reference

Per the official Azure DocumentDB / Cosmos DB for MongoDB vCore vector-search docs, the cosmosSearch operator shape is:

{
  $search: {
    cosmosSearch: {
      path: "<field>",
      vector: [ /* query embedding */ ],
      k: <int>,
      // optional: lSearch, filter, efSearch (HNSW), nProbes (IVF)
    }
  }
}

Validation

• pwsh scripts/validate-skills.ps1 still passes (17/17).
• rg ""cosmosSearch:.*query:"" returns no remaining hits.