public void setEngagementArn(String engagementArn) {
        this.engagementArn = engagementArn;
    }
<p>
The ARN of the engagement.
</p>

@param engagementArn
       The ARN of the engagement.
aws-java-sdk-ssmcontacts/src/main/java/com/amazonaws/services/ssmcontacts/model/StartEngagementResult.java