public java.util.List<UpgradeHistory> getUpgradeHistories() {
        return upgradeHistories;
    }
<p>
A list of objects corresponding to each upgrade or upgrade eligibility check performed on a domain.
</p>

@return A list of objects corresponding to each upgrade or upgrade eligibility check performed on a domain.
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/GetUpgradeHistoryResult.java