public DescribeChangeSetResult withImportExistingResources(Boolean importExistingResources) {
        setImportExistingResources(importExistingResources);
        return this;
    }
<p>
Indicates if the change set imports resources that already exist.
</p>
<note>
<p>
This parameter can only import resources that have <a
href="https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-name.html">custom names</a>
in templates. To import resources that do not accept custom names, such as EC2 instances, use the <a
href="https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resource-import.html">resource import</a>
feature instead.
</p>
</note>

@param importExistingResources
       Indicates if the change set imports resources that already exist.</p> <note>
       <p>
       This parameter can only import resources that have <a
       href="https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-name.html">custom
       names</a> in templates. To import resources that do not accept custom names, such as EC2 instances, use
       the <a href="https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resource-import.html">resource
       import</a> feature instead.
       </p>
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-cloudformation/src/main/java/com/amazonaws/services/cloudformation/model/DescribeChangeSetResult.java