public void setRegisteredContainerInstancesCount(Integer registeredContainerInstancesCount) {
        this.registeredContainerInstancesCount = registeredContainerInstancesCount;
    }
<p>
The number of container instances registered into the cluster.
</p>

@param registeredContainerInstancesCount
       The number of container instances registered into the cluster.
aws-java-sdk-guardduty/src/main/java/com/amazonaws/services/guardduty/model/EcsClusterDetails.java