title: Terraform mongodbatlas disk size scale down unexpected
body: <p>I have <code>backend &quot;remote&quot;</code> configured with provider <code>mongodb/mongodbatlas</code>. Mongodb Atlas cluster configured with <code>auto_scaling_disk_gb_enabled = true</code>. Also during first deploy there was specified <code>disk_size_gb = 15</code>. Since auto scaling is enabled in a while cluster changed size to bigger one <code>21Gb</code>. Next application of terraform script via <code>app.terraform.io</code> showed plan for this cluster which included <code>disk_size_gb : 21 change to 15</code>. Terraform version used: <code>1.1.7</code><br />
  Since I'm quite new to terraform it's not clear for me if this is expected behavior to attempt scaling down disk size? I see specifically this step took lots of time (maybe 40 minutes), however completed successfully. Is this possible to not perform scaling down disk size and leave there <code>disk_size_gb</code> specified?</p>