private static List<ConfigChangeAction> validateContentCluster(ContentCluster currentCluster,
                                                                   ContentCluster nextCluster,
                                                                   DeployState deployState)
    {
        return validateDocumentDatabases(currentCluster, nextCluster, deployState);
    }
Validates the changes between all current and next indexed search clusters in a vespa model.

@author geirst
config-model/src/main/java/com/yahoo/vespa/model/application/validation/change/IndexedSearchClusterChangeValidator.java