private void setTruncated(Map<String, String[]> data) {
        data.put(METADATA_TRUNCATED_KEY, TRUE);
    }
@param maxKeySize maximum key size in UTF-16 bytes-- keys will be truncated to this
                  length; if less than 0, keys will not be truncated
@param maxEstimatedSize
@param includeFields if null or empty, all fields are included; otherwise, which fields
                     to add to the metadata object.
@param excludeFields these fields will not be included (unless they're in {@link StandardWriteFilter#ALWAYS_SET_FIELDS})
@param includeEmpty if <code>true</code>, this will set or add an empty value to the
                    metadata object.
tika-core/src/main/java/org/apache/tika/metadata/writefilter/StandardWriteFilter.java