private static boolean hasFastAccessAttribute(String attrName, AttributeFields attributes) {
        Attribute attr = attributes.getAttribute(attrName);
        return (attr != null && attr.isFastAccess());
    }
Validates the changes between all current and next streaming search clusters in a Vespa model.

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