public String getEngineVersion() {
        return this.engineVersion;
    }
<p>
Version of OpenSearch or Elasticsearch, in the format Elasticsearch_X.Y or OpenSearch_X.Y. Defaults to the latest
version of OpenSearch.
</p>

@return Version of OpenSearch or Elasticsearch, in the format Elasticsearch_X.Y or OpenSearch_X.Y. Defaults to
        the latest version of OpenSearch.
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/PackageDetails.java