I created a collection explicitly in MongoDB 3.4 in order to define the collation:

db.createCollection("mycoll", {collation: {
  "locale": "en_US", 
  "strength": 1, 
  "caseLevel": false, 
  "numericOrdering": false, 
  "maxVariable": "punct", 
  "caseFirst": "off", 
  "alternate": "non-ignorable", 
  "normalization": false, 
  "backwards": false
}})

Now I want to check the collation associated with that collection but I can't find a command to show that information. I tested the following commands:

db.mycoll.stats()
db.runCommand({collStats: "mycoll"})

After reviewing all the output from the last command I found the collation under the indexDetails section inside _id index but it's the index collation not the collection collation. Take in account that if collection was created with autoIndexId=false then indexDetails is missed. I also test the collection using MongoDB Compass but I can't find the collation either so:

How to know the collation of a specific collection?

Thanks