public Builder clearKey() {
        key_ = getDefaultInstance().getKey();
        bitField0_ = (bitField0_ & ~0x00000001);
        onChanged();
        return this;
      }
<pre>
Key of tag.
</pre>

<code>string key = 1;</code>

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