protected boolean shouldWaitClientAck(TEnvironment env) {
    return true;
  }
By default, the executor will keep the procedure result around util the eviction TTL is
expired. The client can cut down the waiting time by requesting that the result is removed from
the executor. In case of system started procedure, we can force the executor to auto-ack.
@param env the environment passed to the ProcedureExecutor
@return true if the executor should wait the client ack for the result. Defaults to return
        true.
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/Procedure.java