I think it's hard to compare the results here?
In test 1 (single IW shared across threads) you end up with one index.
In test 2 (private IW per thread) you end up with N indexes, which to
be "fair" need to be merged down into one index (eg with .addIndexes)?
Or seen another way, test 1 should ha
Contention. There is always a limit somewhere, I/O, CPU, memory, locks, ...
Use your OS tools or java profiling/logging/debugging to find out what
is going on - or just go with what works for you.
If you're doing something like loading data read from a database, it
is my experience that the bott
