public void setInstanceType(String instanceType) {
        this.instanceType = instanceType;
    }
<p>
The OpenSearch instance type offered by theReserved Instance offering.
</p>

@param instanceType
       The OpenSearch instance type offered by theReserved Instance offering.
@see OpenSearchPartitionInstanceType
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/ReservedInstance.java