public Long getLastSuccessfullyAppliedConfigurationsVersion() {
        return this.lastSuccessfullyAppliedConfigurationsVersion;
    }
<p>
The version number of a configuration specification that was successfully applied for an instance group last
time.
</p>

@return The version number of a configuration specification that was successfully applied for an instance group
        last time.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroup.java