Sub Doc Operations Expected Response

Couchbase Server
1

Is there any Docs avail what the expected response for a successful Sub Doc Delete operation is.
In my case i

bucket
      .mutateIn(docID)
      .remove(path)
      .execute((err, result)

and my result looks like this which really doesn’t tell you much

{
“cas”: “1553198421978382336”,
“contents”: [
{
“id”: 0,
“value”: ,
“path”: “emails”
}
],
“pathMap”: null,
“indexMap”: null
}

is there anyplace i can see if it succeeded short of query the doc again ?