public synchronized E get(ID id) {
    queryHolder.setId(id);
    return get(queryHolder);
  }
Get the element by id. It returns null if it doesn't exist.

@param id the id of the element.
@return the removed element.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/schedule/queue/IndexedBlockingQueue.java