private boolean legalDottedPositionField(SDField field) {
        return field.getName().endsWith(".position") || field.getName().endsWith(".distance");
    }
In {@link CreatePositionZCurve} we add some .position and .distance fields for pos fields. Make an exception for those for now.
TODO Vespa 9: delete this method.

@param field an {@link com.yahoo.schema.document.SDField}
@return true if allowed
config-model/src/main/java/com/yahoo/schema/processing/IndexFieldNames.java