public void addPair(String key,
Add a [key,value] pair to this document. Note that the document really
contains a multi-map, so it is okay and normal to call addPair multiple
times with the same key. This just adds the value to the set of values
associated with the key.
key - The key that you will later search by. Note that you are NOT
allowed to use the keys filename or timestamp
since these are reserved (and in fact used) by GSF.
value - The value that will be retrieved for this key
searchable - A boolean which if set to true will store the pair with
an indexed/searchable field key, otherwise with an unindexed field (that cannot be
searched). You must be consistent in how keys are identified
as searchable; the same key must always be referenced with the same
value for searchable when pairs are added (per document).