java.lang.Boolean#getBoolean(java.lang.String)

org.apache.lucene.util.IOUtils @ use @org.elasticsearch.core.internal.io instead

@defaultMessage use executors from org.elasticsearch.common.util.concurrent.EsExecutors instead which will properly bubble up Errors
java.util.concurrent.AbstractExecutorService#<init>()
java.util.concurrent.ThreadPoolExecutor#<init>(int, int, long, java.util.concurrent.TimeUnit, java.util.concurrent.BlockingQueue)