public void set(String name, String value) {
        writeFilter.set(name, value, metadata);
    }
Set metadata name/value. Associate the specified value to the specified
metadata name. If some previous values were associated to this name,
they are removed. If the given value is <code>null</code>, then the
metadata entry is removed.

@param name  the metadata name.
@param value the metadata value, or <code>null</code>
tika-core/src/main/java/org/apache/tika/metadata/Metadata.java