public java.util.List<String> getCacheSecurityGroupNames() {
        if (cacheSecurityGroupNames == null) {
            cacheSecurityGroupNames = new com.amazonaws.internal.SdkInternalList<String>();
        }
        return cacheSecurityGroupNames;
    }
<p>
A list of cache security group names to authorize on this cluster. This change is asynchronously applied as soon
as possible.
</p>
<p>
You can use this parameter only with clusters that are created outside of an Amazon Virtual Private Cloud (Amazon
VPC).
</p>
<p>
Constraints: Must contain no more than 255 alphanumeric characters. Must not be "Default".
</p>

@return A list of cache security group names to authorize on this cluster. This change is asynchronously applied
        as soon as possible.</p>
        <p>
        You can use this parameter only with clusters that are created outside of an Amazon Virtual Private Cloud
        (Amazon VPC).
        </p>
        <p>
        Constraints: Must contain no more than 255 alphanumeric characters. Must not be "Default".
aws-java-sdk-elasticache/src/main/java/com/amazonaws/services/elasticache/model/ModifyCacheClusterRequest.java