public Builder clearPreviousVersion() {
      previousVersion_ = getDefaultInstance().getPreviousVersion();
      bitField0_ = (bitField0_ & ~0x00000010);
      onChanged();
      return this;
    }
<pre>
The version from which we upgraded.
</pre>

<code>string previous_version = 5;</code>

@return This builder for chaining.
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/UpgradeStatus.java