public Boolean getAllowMajorVersionUpgrade() {
        return this.allowMajorVersionUpgrade;
    }
<p>
Specifies whether to allow major version upgrades.
</p>
<p>
Constraints: Must be enabled if you specify a value for the <code>EngineVersion</code> parameter that's a
different major version than the global cluster's current version.
</p>
<p>
If you upgrade the major version of a global database, the cluster and DB instance parameter groups are set to
the default parameter groups for the new version. Apply any custom parameter groups after completing the upgrade.
</p>

@return Specifies whether to allow major version upgrades.</p>
        <p>
        Constraints: Must be enabled if you specify a value for the <code>EngineVersion</code> parameter that's a
        different major version than the global cluster's current version.
        </p>
        <p>
        If you upgrade the major version of a global database, the cluster and DB instance parameter groups are
        set to the default parameter groups for the new version. Apply any custom parameter groups after
        completing the upgrade.
aws-java-sdk-rds/src/main/java/com/amazonaws/services/rds/model/ModifyGlobalClusterRequest.java