public MergePullRequestByFastForwardRequest withPullRequestId(String pullRequestId) {
        setPullRequestId(pullRequestId);
        return this;
    }
<p>
The system-generated ID of the pull request. To get this ID, use <a>ListPullRequests</a>.
</p>

@param pullRequestId
       The system-generated ID of the pull request. To get this ID, use <a>ListPullRequests</a>.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-codecommit/src/main/java/com/amazonaws/services/codecommit/model/MergePullRequestByFastForwardRequest.java