public void updateMatch(Case casing) {
        if (this.casing != null && this.casing != casing) {
            throw new IllegalArgumentException("dictionary match mode has already been set to " + this.casing);
        }
        this.casing = casing;
    }
Represents settings for dictionary control

@author baldersheim
config-model/src/main/java/com/yahoo/schema/document/Dictionary.java