public Builder clearTag() {
      tag_ = getDefaultInstance().getTag();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
Optional. Tag of the operator.
</pre>

<code>string tag = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

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