Monk Create Index Documentation

While doing this:
**users.index({"username": 1}, {unique: true});**
I get a deprecation notice like this:
**DEPRECATED (collection.ensureIndex): use collection.createIndex instead (see https://Automattic.github.io/monk/docs/collection/createIndex.html)**
But on the documentation page ie https://Automattic.github.io/monk/docs/collection/createIndex.html, no such warning is listed. So I guess documentation needs a update about deprecation?

Start from the collection/createIndex documentation page linked in the issue and compare its index examples with the deprecation notice produced by users.index({"username": 1}, {unique: true}). Update the documentation to explain the deprecated ensureIndex behavior and the createIndex replacement, then verify the rendered page includes the warning.

Written by the indexing model from the issue text.