View mongo’s Index Building Status

  mongodb, question

I built the index on mongo, because the amount of data is very large, I want to know the progress of building the index.
Currentop ();
How do you check the status later?

https://docs.mongodb.com/manu …

db.currentOp(
 {
 $or: [
 { op: "command", "query.createIndexes": { $exists: true } },
 { op: "none", ns: /\.system\.indexes\b/ }
 ]
 }
 )