@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getUpgradeStep() != null)
            sb.append("UpgradeStep: ").append(getUpgradeStep()).append(",");
        if (getUpgradeStepStatus() != null)
            sb.append("UpgradeStepStatus: ").append(getUpgradeStepStatus()).append(",");
        if (getIssues() != null)
            sb.append("Issues: ").append(getIssues()).append(",");
        if (getProgressPercent() != null)
            sb.append("ProgressPercent: ").append(getProgressPercent());
        sb.append("}");
        return sb.toString();
    }
Returns a string representation of this object. This is useful for testing and debugging. Sensitive data will be
redacted from this string using a placeholder value.

@return A string representation of this object.

@see java.lang.Object#toString()
aws-java-sdk-elasticsearch/src/main/java/com/amazonaws/services/elasticsearch/model/UpgradeStepItem.java