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

@return The 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/ListInstanceTypeDetailsRequest.java