public Boolean isRetainStacks() {
        return this.retainStacks;
    }
<p>
Removes the stack instances from the specified stack set, but doesn't delete the stacks. You can't reassociate a
retained stack or add an existing, saved stack to a new stack set.
</p>
<p>
For more information, see <a href=
"https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacksets-concepts.html#stackset-ops-options"
>Stack set operation options</a>.
</p>

@return Removes the stack instances from the specified stack set, but doesn't delete the stacks. You can't
        reassociate a retained stack or add an existing, saved stack to a new stack set.</p>
        <p>
        For more information, see <a href=
        "https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacksets-concepts.html#stackset-ops-options"
        >Stack set operation options</a>.
aws-java-sdk-cloudformation/src/main/java/com/amazonaws/services/cloudformation/model/DeleteStackInstancesRequest.java