Memory usage in IndexStatuses

[isoboroff]

IndexStatuses can OOM in the last stage, when it calls write.forceMerge(1). An OOM in this case destroys the index, perhaps this is due to the actions in the finally{} clause?

This should be more robust. stewdhcs suggested a custom merge policy in issue #17.

[lintool]

The final forceMerge is to merge all single index segments into a single one for better retrieval performance (this used to be the "optimize" method in earlier versions of Lucene). I think the simplest solution is to have this as a command line parameter (e.g., -optimize) that's not set by default.