public Builder clearForce() {
        bitField0_ = (bitField0_ & ~0x00000004);
        force_ = false;
        onChanged();
        return this;
      }
<code>optional bool force = 3 [default = false];</code>
metamorphosis-server/src/main/java/com/taobao/metamorphosis/server/transaction/store/TransactionCommands.java