A question about AWSKMS shutdown function

[isaac33zhang]

Hi,
We use the STSAssumeRoleSessionCredentialsProvider in AWSKMS build. STSAssumeRoleSessionCredentialsProvider has a background thread to refresh the credentials and a close function to shut the thread down.
Our question is does the shutdown function in AWSKMS close the background thread too: https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/services/kms/AWSKMS.html#shutdown--?
Thanks!