public Builder clearSpecExecutionEndingRequest() {
        if (specExecutionEndingRequestBuilder_ == null) {
          specExecutionEndingRequest_ = main.Messages.SpecExecutionEndingRequest.getDefaultInstance();
          onChanged();
        } else {
          specExecutionEndingRequestBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000010);
        return this;
      }