@Override
    public String toString() {
        return "StandardWriteFilterFactory{" + "includeFields=" + includeFields + ", maxKeySize=" +
                maxKeySize + ", maxFieldSize=" + maxFieldSize + ", maxTotalEstimatedBytes=" +
                maxTotalEstimatedBytes + ", maxValuesPerField=" + maxValuesPerField +
                ", includeEmpty=" + includeEmpty + '}';
    }
Factory class for {@link StandardWriteFilter}. See that class
for how the estimated sizes are calculated on Strings.
tika-core/src/main/java/org/apache/tika/metadata/writefilter/StandardWriteFilterFactory.java