public void setCluster(String cluster) {
        this.cluster = cluster;
    }
<p>
The short name or full Amazon Resource Name (ARN) of the cluster that hosts the task or tasks to describe. If you
do not specify a cluster, the default cluster is assumed. This parameter is required if the task or tasks you are
describing were launched in any cluster other than the default cluster.
</p>

@param cluster
       The short name or full Amazon Resource Name (ARN) of the cluster that hosts the task or tasks to describe.
       If you do not specify a cluster, the default cluster is assumed. This parameter is required if the task or
       tasks you are describing were launched in any cluster other than the default cluster.
aws-java-sdk-ecs/src/main/java/com/amazonaws/services/ecs/model/DescribeTasksRequest.java