How to set up atlas search index for field inside an array?

MongoDB Atlas Atlas Search
3

Hi ,
i created a new search index with below json config.

{
  "mappings": {
    "fields": {
      "items": {
        "dynamic": false,
        "fields": {
          "name": {
            "type": "autocomplete"
          }
        },
        "type": "embeddedDocuments"
      }
    }
  }
}

But when i try to execute .

{
  index: 'embedded',
  autocomplete: {
    query: 'dp',
    path: 'name',
    tokenOrder: 'sequential',
    fuzzy: {
      // maxEdits: 1,
      // "maxExpansions": 100,
    }
  }
}

I got below error
PlanExecutor error during aggregation :: caused by :: Remote error from mongot :: caused by :: autocomplete index field definition not present at path materialNo