Create a block direct index from a BlockInvertedIndex.
Properties:
- inverted2direct.processtokens - total number of tokens to attempt each iteration. Defaults to 50000000. Memory usage would more likely be linked to the number of pointers and the number of blocks, however as the document index does not contain these statistics on a document basis. these are impossible to estimate. Note that the default is less than Inverted2DirectIndexBuilder.
@author Craig Macdonald
@since 2.0