rdf_litindex:rdf_set_literal_index

Set options for the literal package. Currently defined options

verbose(Bool): If true, print progress messages while building the index tables.
index_threads(+Count): Number of threads to use for initial indexing of literals
index(+How): How to deal with indexing new literals. How is one of self (execute in the same thread), thread(N) (execute in N concurrent threads) or default (depends on number of cores).
stopgap_threshold(+Count): Add a token to the dynamic stopgap set if it appears in more than Count literals. The default is 50,000.