@Override
    public void process(boolean validate, boolean documentsOnly, ModelContext.Properties properties) {
        this.useV8GeoPositions = properties.featureFlags().useV8GeoPositions();
        process(validate, documentsOnly);
    }
Adds a "fieldName_zcurve" long attribute and "fieldName.distance" and "FieldName.position" summary fields to all position type fields.

@author bratseth
config-model/src/main/java/com/yahoo/schema/processing/CreatePositionZCurve.java