I'm performing an import from Cognito and we have usernames that are completely unique on it. The import API for FusionAuth will error out if there is a duplicate user being inserted.

I'm trying to write something that will filter out users already imported into FusionAuth from Cognito, but the User search API using elasticsearch (I'm on hosted FA) doesn't always return results when I search by username using queryString.

Is there a better way to go about searching for users against a username?