@Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getDBInstanceIdentifier() != null)
            sb.append("DBInstanceIdentifier: ").append(getDBInstanceIdentifier()).append(",");
        if (getIsClusterWriter() != null)
            sb.append("IsClusterWriter: ").append(getIsClusterWriter()).append(",");
        if (getDBClusterParameterGroupStatus() != null)
            sb.append("DBClusterParameterGroupStatus: ").append(getDBClusterParameterGroupStatus()).append(",");
        if (getPromotionTier() != null)
            sb.append("PromotionTier: ").append(getPromotionTier());
        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-docdb/src/main/java/com/amazonaws/services/docdb/model/DBClusterMember.java