@Override
  protected void doStop() {
    LOG.debug("Invalidating LogSearch caches");
    // invalidate the caches
    logFileNameCache.invalidateAll();

    logFileTailURICache.invalidateAll();
  }
Executor instance to be used to run REST queries against
the LogSearch service.
ambari-server/src/main/java/org/apache/ambari/server/controller/logging/LogSearchDataRetrievalService.java