public String getExternalId() {
        return this.externalId;
    }
<p>
The unique ID of an external resource (for example, a CloudFormation stack ID) that is linked to one or more
CodeDeploy resources.
</p>

@return The unique ID of an external resource (for example, a CloudFormation stack ID) that is linked to one or
        more CodeDeploy resources.
aws-java-sdk-codedeploy/src/main/java/com/amazonaws/services/codedeploy/model/DeleteResourcesByExternalIdRequest.java