public void setFieldPositionMap(final Map<String, Integer> fieldPositionMap) {
        this.fieldPositionMap = fieldPositionMap;
    }
Added to ensure map is not made final which would break GWT
serialisation.
stroom-legacy/stroom-legacy-model_6_1/src/main/java/stroom/legacy/model_6_1/StroomStatsStoreEntityData.java