public String getDomainName() {
        return this.domainName;
    }
<p>
DomainName represents the name of the Domain that we are trying to modify. This should be present only if we are
querying for list of available Elasticsearch instance types when modifying existing domain.
</p>

@return DomainName represents the name of the Domain that we are trying to modify. This should be present only if
        we are querying for list of available Elasticsearch instance types when modifying existing domain.
aws-java-sdk-elasticsearch/src/main/java/com/amazonaws/services/elasticsearch/model/ListElasticsearchInstanceTypesRequest.java