public Builder clearMid() {
      mid_ = getDefaultInstance().getMid();
      bitField0_ = (bitField0_ & ~0x00000001);
      onChanged();
      return this;
    }
<pre>
Opaque entity ID. Some IDs may be available in
[Google Knowledge Graph Search
API](https://developers.google.com/knowledge-graph/).
</pre>

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

@return This builder for chaining.
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/EntityAnnotation.java