public void setDomainName(String domainName) {
        this.domainName = 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>

@param domainName
       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