public Boolean isDefaultOnly() {
        return this.defaultOnly;
    }
<p>
Indicates that only the default version of the specified engine or engine and major version combination is
returned.
</p>

@return Indicates that only the default version of the specified engine or engine and major version combination
        is returned.
aws-java-sdk-neptune/src/main/java/com/amazonaws/services/neptune/model/DescribeDBEngineVersionsRequest.java