public Builder setEtag(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      etag_ = value;
      bitField0_ |= 0x00000020;
      onChanged();
      return this;
    }
<pre>
Used to perform consistent read-modify-write updates. If not set, a blind
"overwrite" update happens.
</pre>

<code>string etag = 6;</code>

@param value The etag to set.
@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Endpoint.java