public void setConfigurationsVersion(Long configurationsVersion) {
        this.configurationsVersion = configurationsVersion;
    }
<p>
The version number of the requested configuration specification for this instance group.
</p>

@param configurationsVersion
       The version number of the requested configuration specification for this instance group.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroup.java