sort and facet in Atlas Search with child fields

sortFacetParentDocByChildField-sortChildDocsWithSortArray

// Index for faceting and sorting on child fields
{
  "mappings": {
    "dynamic": true,
    "fields": {
      "embeddedDocField": [
        {
          "type": "document",
          "dynamic": true,
          "fields": {
            "facetField": {
              "type": "stringFacet"
            },
            "sortField": {
              "type": "token"
            }
          }
        },
        {
          "type": "embeddedDocuments",
          "dynamic": true,
          "fields": {
            "sortField": [
              {
                "type": "string"
              },
              {
                "type": "autocomplete"
              }
            ]
          }
        }
      ]
    }
  }
}


# CASE 1: Facet query, grouped by parent docs
[
  {
    $searchMeta: {
      facet: {
        facets: {
          childFieldFacet: {
            path: "embeddedDocField.facetField",
            type: "string"
          }
        }
      }
    }
  }
]

# CASE 2: Sort query; parent docs sorted within Atlas search; child docs sorted with $sortArray
[
  {
    $search: {
      text: {
        path: "embeddedDocField.textField",
        query: "query"
      }
      // sorts parent docs
      sort: {
        "embeddedDocField.sortField": -1
      }
    }
  },
  {
    $project: {
      "_id": 1,
      "embeddedDocField": 1,
      //sorts child docs
      "sortedChildDocs": {
        $sortArray: {
          input: "$embeddedDocField",
          sortBy: { "sortField": -1 }
        }
      }
    }
  }
]