Reports

You should add an additional index type within the vector search index JSON config.

This is my Vector Search Index that solve the issue for your reference :

{
  "fields": [
    {
      "numDimensions": 1536,
      "path": "<<path_embedding>",
      "similarity": "cosine",
      "type": "vector"
    },
    {
      "path": "question_id",    // The collection field to be used within the filter  
      "type": "filter"
    }
  ]
}

After made change and let the index rebuilt, there issue should be gone, hope this works for you, too.

Reference : https://www.mongodb.com/docs/atlas/atlas-vector-search/vector-search-type/[Reference here ](https://www.mongodb.com/docs/atlas/atlas-vector-search/vector-search-type/)

Happy coding :)

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