Query expression confirming to the OCI Search Language syntax to select compute instances for the group. The language is documented at https://docs.oracle.com/en-us/iaas/Content/Search/Concepts/querysyntax.htm
Region identifier referred by the deployment environment. Region identifiers are listed at https://docs.oracle.com/en-us/iaas/Content/General/Concepts/regions.htm
Specifies the Compute instance group environment filtered by the RQS query expression.