public boolean getAutosizingEnabled() {
    return getBoolean(JOB_AUTOSIZING_ENABLED, false);
  }
Return the value of JOB_CONTAINER_THREAD_POOL_SIZE if autosizing is not enabled,
otherwise returns the value of JOB_AUTOSIZING_CONTAINER_THREAD_POOL_SIZE.
@return
samza-core/src/main/java/org/apache/samza/config/JobConfig.java