# These methods spawn threads with vague names. Use a custom thread factory and name
# threads so that you can tell (by its name) which executor it is associated with.
# see Solr's DefaultSolrThreadFactory
# see Lucene's NamedThreadFactory

java.util.concurrent.Executors#newFixedThreadPool(int)
java.util.concurrent.Executors#newSingleThreadExecutor()
java.util.concurrent.Executors#newCachedThreadPool()
java.util.concurrent.Executors#newSingleThreadScheduledExecutor()
java.util.concurrent.Executors#newScheduledThreadPool(int)
java.util.concurrent.Executors#defaultThreadFactory()
java.util.concurrent.Executors#privilegedThreadFactory()