public Integer getPromotionTier() {
        return this.promotionTier;
    }
<p>
A value that specifies the order in which an Amazon DocumentDB replica is promoted to the primary instance after
a failure of the existing primary instance.
</p>

@return A value that specifies the order in which an Amazon DocumentDB replica is promoted to the primary
        instance after a failure of the existing primary instance.
aws-java-sdk-docdb/src/main/java/com/amazonaws/services/docdb/model/DBClusterMember.java