MongoDB Atlas Search: Issue with fuzzy search in a multi analyzer within an embeddedDocument operator

MongoDB Atlas Atlas Search
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1

I’m experiencing an issue when attempting to perform a fuzzy search in a multi analyzer within an embeddedDocument operator. When running the following query:

// Mongo shell query
db.documents.aggregate([
  {
    $search: {
      compound: {
        filter: [
          {
            embeddedDocument: {
              path: "lineItems",
              operator: {
                compound: {
                  filter: [
                    {
                      compound: {
                        should: [
                          {
                            text: {
                              path: { value: "lineItems.description", multi: "keywordAnalyzer" },
                              query: "Payment for something veBy valYable",
                              fuzzy: { maxEdits: 2 }
                            }
                          }
                        ],
                        minimumShouldMatch: 1
                      }
                    }
                  ]
                }
              }
            }
          }
        ]
      },
      returnStoredSource: true
    }
  }
]);

I get the following error:

MongoServerError: lineItems.description (multi: keywordAnalyzer) not found in index: default

However, when I remove the fuzzy clause from the query, it works fine. This issue only occurs when I combine fuzzy search, multi analyzer, and embeddedDocument operator. The same query works as expected for a different collection which does not use the embeddedDocument operator.

Here is the simplified index configuration related to the field being queried:

{
  "analyzer": "lucene.simple",
  "searchAnalyzer": "lucene.simple",
  "dynamic": false,
  "fields": {
    "lineItems": {
      "type": "document",
      "fields": {
        "description": {
          "analyzer": "lucene.simple",
          "multi": {
            "keywordAnalyzer": {
              "analyzer": "custom.keyword.lowercase",
              "type": "string"
            }
          },
          "type": "string"
        }
      }
    }
  },
  "analyzers": [
     {
       "name": "custom.keyword.lowercase",
      "charFilters": [],
       "tokenFilters": [
         {
           "type": "lowercase"
         }
       ],
       "tokenizer": {
         "type": "keyword"
       }
     }
   ],
   "storedSource": {
     "include": [
       "lineItems.description"
     ]
   }
}

And here is an example document that the query should match:

{
  "_id": ObjectId("60b5a2f2f98a5d001f8b87a1"),
  "lineItems": [
    {
      "description": "Payment for something very valuable",
      // other fields...
    },
    // other line items...
  ],
  // other fields...
}

Is this a known issue or limitation with MongoDB Atlas Search, or could this be a bug? Your help in resolving this issue is greatly appreciated.